RRC PDU Session Release: DRBs and PDU session teardown in NGAP PDU Session Release Response callback

We need to keep PDU sessions and DRBs in list until the NGAP PDU Session Release Response is sent.

* Introduced find_drb() and remove_drbs_by_pdu_session() helpers to locate
  and clean up DRBs linked to a specific PDU session
* Targeted per-session DRB removal in rrc_gNB_send_NGAP_PDUSESSION_RELEASE_RESPONSE()
* Ensures DRBs for unaffected PDU sessions remain intact
* Remove unused PDU_SESSION_STATUS_RELEASED status: keeping this status is no longer relevant
  since the PDU sessions are effectively removed from the RRC lists

Closes #867

Also, refactor rrc_gNB_process_NGAP_PDUSESSION_RELEASE_COMMAND

3GPP TS 38.413 8.2.2 PDU Session Resource Release says:

> upon reception the NG-RAN node shall execute the release of the requested PDU sessions.
> For each PDU session to be released the NG-RAN node shall release the corresponding
> resources over Uu and over NG, if any.

Therefore, any PDU session in the pdusession_release_params list that is
also present in the RRC list can be set to release, regardless of its status.

The function signature was also updated along with other minor changes.

The partial-tunnel deletion API was buggy and redundant:
* e.g. It erased entries from globGtp.te2ue_mapping but never erases
  the corresponding entries from inst->ue2te_mapping[ue].bearers

All current use cases are already covered by:
* newGtpuDeleteOneTunnel() for targeted deletion
* newGtpuDeleteAllTunnels() for full cleanup

Call sites should explicitly loop over newGtpuDeleteOneTunnel()
if multiple tunnels need removal.

This commit implements proper PDU Session Release handling across
RRC, PDCP, F1AP, E1AP to ensure clean resource cleanup when
a PDU session is terminated.

Key changes:

NGAP:

In `rrc_gNB_process_NGAP_PDUSESSION_RELEASE_COMMAND()`:
  * Populates E1AP Bearer Modification for each released session
  * If a CU-UP is connected, triggers `bearer_context_mod()` for PDU teardown

PDCP:
 * Added `nr_pdcp_release_drbs()` to remove all DRBs linked to a given PDU session
 * Called from `e1_bearer_context_modif()` for correct clean-up during session release

F1AP UE Context Modification:

  Replace direct RRC message transfer with F1AP UE Context Modification Request
  to properly handle PDU session release according to 3GPP TS 38.331.

  3GPP TS 38.331 `5.3.5.6.4 DRB release` says: whether or not the RLC and MAC entities associated
  with a PDCP entity are reset or released is determined by the CellGroupConfig. Thus,
  updated CellGroupConfig needs to be received by the UE. This has to be retrieved by CUCP
  from the DU. Therefore:

  After receiving an NGAP_PDUSESSION_RELEASE_COMMAND, the CUCP shall:
  1) forward (store for later) the NAS PDU to the UE, if present as per 3GPP TS 38.413, and
  2) send a UE Context Modification to the DU with the list of DRBs to release
     and the RRC container (RRCReconfiguration with NAS PDU)

  After reception of UE Context Modification Response, the list of drbs to release
  is prepared based on PDU session status PDU_SESSION_STATUS_TORELEASE
  in rrc_gNB_generate_dedicatedRRCReconfiguration and then encoded
  in drb_ToReleaseList for a new RRCReconfiguration with the new cellGroupConfig.

  Key changes:
  * rrc_gNB_generate_dedicatedRRCReconfiguration_release() now uses F1AP UE Context
    Modification Request instead of direct RRC transfer
  * Only DRBs to be released are now added to the list.
  * The ASN.1 memory allocation is entirely done in build_RRCReconfiguration_IEs
  * No longer needed to store ASN1 struct in UE context

GTP-U:
  * Previous implementation had incomplete tunnel cleanup during PDU session release
    - Missing distinction between N3 (PDU session level) and F1-U (DRB level) tunnels
    - Lack of proper DRB identification for F1-U tunnel deletion
  Major Changes:
  * GTP tunnel teardown now handled in `e1_bearer_context_modif()` using the correct
  F1 or N3 GTP instance (`newGtpuDeleteOneTunnel()`)
  * Enhanced Tunnel Deletion Logic (cucp_cuup_handler.c):
   - Separate handling for N3 tunnels (1 per PDU session) and F1-U tunnels (1 per DRB)
   - Added proper DRB identification for F1-U tunnel cleanup
   - Improved error handling with detailed logging for each tunnel deletion
   - Enhanced logging to distinguish between N3 and F1-U tunnel operations
  * New PDCP API Function (nr_pdcp_oai_api.c/h):
   - Added nr_pdcp_get_drb_ids_for_pdusession() function
   - Enables retrieval of all DRB IDs associated with a specific PDU session
   - Supports proper F1-U tunnel cleanup by providing DRB identifiers in CUUP
  * Enhanced GTP Interface (gtp_itf.cpp/h):
   - Modified newGtpuDeleteOneTunnel() to accept tunnel_type parameter
   - Improved logging to distinguish between PDU session and DRB tunnel types
   - Better error messages for tunnel deletion failures
   - Enhanced debugging information for remaining tunnels

Clean-up:
* Ensured xid tracking works consistently between PDU Session Establishment (with NAS PDU)
  and dedicated RRCReconfiguration
* Add function to release GTP-U tunnel in Bearer Context Modification Request handler
* Do not send rrc_gNB_send_NGAP_PDUSESSION_RELEASE_RESPONSE when no PDU session are to
  be released: it is sent upon completion of the RRCReconfiguration and needs to contain
  released PDU Sessions (mandatory IE), therefore it is no necessary to send it in case
  there is no PDU session to release.

Related to #867
Co-authored-by: rmagueta <rmagueta@allbesmart.pt>

Problem:
- GTP-U logs showed negative TEID values (e.g., -1943516315) due to signed/unsigned
conversion. Due to wrong conversion from uint32_t to int and overflow caused negative values.
- TEID values were inconsistently formatted across different log statements, due to
mixed use of %d, %u, %x formats for TEID logging. Made debugging and troubleshooting difficult

Changes:
1. Fixed signed/unsigned conversion bug: use teid_t. Prevents overflow when TEID values exceed int range.
2. Standardized TEID logging format: all TEID values now use '0x%x' hexadecimal format.
   Consistent 'TEID' capitalization throughout

The previously introduced function rrc_release_rlc_entity has been
adopted to deactvate the RLC entities after release.

Do not add PDU Session with status higher than PDU_SESSION_STATUS_TOMODIFY
which means, do not add "failed" or "to release" PDU Sessions.

According to TS 38.463 - clause 9.2.2.4 and 9.3.3.12.
Also, fix response message by encoding choice IE only
with presence of modified PDU sessions.
Co-authored-by: rmagueta <rmagueta@allbesmart.pt>

Integration `2025.w45`

* !3736 fix bugs in scope for pdcch, and optimize cpu cost of pdcch decoding
* !3743 NR UE: fix PDCCH LLR indexing for different search space RB sizes
* !3739 Bugfix: save old tunnel info to remain the user plane connection while rolling back to source DU due to handover failure
* !3742 Simplify node management in CI, handle SIGINT
* !3670 PRS bug fix and CI Integration
* !3746 Fix unsigned to signed decoding parameters to allow for 'no affinity'/'no pin' threads to CPUs
* !3738 CI: Add new Jenkinsfiles

Closes #984 and #1021

See merge request oai/openairinterface5g!3744

CI: Add unified Jenkinsfile for all test pipelines

This MR introduces a single Jenkinsfile to cover all current CI test pipelines
Improvements:
- correct reporting of the start timestamp in the HTML report
- harmonize log collection - always collect as test_logs_${env.BUILD_ID}.zip

Combine Jenkinsfile and Jenkinsfile-oc from parrent commit into a single
file.

Fix unsigned to signed decoding parameters to allow for 'no affinity'/'no pin'
threads to CPUs

By default, 'L1_rx_thread_core', 'L1_tx_thread_core', 'ru_thread_core' are set
to '-1' but the values were decoded from config file as unsigned instead of
signed types, thus, it was not allowing to set them with '-1' from config file.

Merge remote-tracking branch 'origin/prs_bug_fix_and_integrate_to_ci' into integration_2025_w45 (!3670)

PRS bug fix and CI Integration

- Fix the bug in PRS channel estimation while copying memory to compute the
  impulse response
- Integrate PRS testing to CI

Simplify node management in CI, handle SIGINT

- Make a single <node> XML step entry common to all XML steps to harmonize code
- Handle SIGINT to make it possible to more easily stop the CI script.

Bugfix: save old tunnel info to remain the user plane connection while rolling
back to source DU due to handover failure

This MR closes issue #984 that UE lost the data plane connection while rolling
back to the source DU due to handover failure.

NR UE: fix PDCCH LLR indexing for different search space RB sizes

After !3603 (merged), when multiple search spaces have different CORESET
configurations (different number of RBs), the LLR buffer stride must be
calculated based on the maximum RB size across all search spaces, not the
current search space's RB size.

The LLR buffer is allocated with size based on get_pdcch_max_rbs(), but the
demapping function was using coreset_nbr_rb (current search space) for symbol
stride calculation, causing incorrect LLR extraction when search spaces have
different RB configurations.

This MR tries to fix it.

Closes #1021

By default, 'L1_rx_thread_core', 'L1_tx_thread_core', 'ru_thread_core' are set to '-1' but the values were decoded from config file as unsigned instead of signed types, thus, it was not allowing to set them with '-1' from config file

Use the bash script from a parent commit to verify PRS functionality.

This commit inputs several distances at once and obtain the summary of
successful and failed tests. We look for the number of successful tests
that are geater than 0. We do that here since we sometimes dont receive
a response for a telnet command from the rfsim although the command
is applied. This is related to the queing telnet commands in the rfsim.

The script for the distances 50, 100 and 150 are called as follows,

./set-and-verify-distance-prs.sh 50 100 150

The summary can be viewed as follows,
==================== SUMMARY ====================
Total tests run : 3
Successful tests: 3
Failed tests    : 0
=================================================

Set RFsim (DL) distance and use PRS to estimate the new distance. This
is verified by comparing the distance set in RFsim with the distance
reported through ToA estimation at the UE.

Note that since RFsim telnet output is asynchronous (it uses a queue
internally), we use grep --max-count 1 to wait for the matching line,
together with ncat --idle 0.3 to keep ncat open for some time. The
--max-count option will terminate grep after the first occurrence. For
this to work reliably, we need to use grep <(echo | ncat) as opposod to
simply echo | ncat | grep, as the latter does not seem to reliably
make grep exit after the occurrence.
Co-authored-by: Robert Schmidt <robert.schmidt@openairinterface.org>

Protect with mutex to allow reading from another thread.

In a future commit, we will look up the maximum ToA over the last
transmissions. Introduce a buffer in which we write the last
16 measurements.

fix bugs in scope for pdcch, and optimize cpu cost of pdcch decoding

fix bugs in scope for pdcch, and optimize cpu cost of pdcch decoding by not
processing useless samples in one symbol

When multiple search spaces have different CORESET configurations
(different number of RBs), the LLR buffer stride must be calculated
based on the maximum RB size across all search spaces, not the
current search space's RB size.

The LLR buffer is allocated with size based on get_pdcch_max_rbs(),
but the demapping function was using coreset_nbr_rb (current search
space) for symbol stride calculation, causing incorrect LLR extraction
when search spaces have different RB configurations.

Bugfix: save old tunnel info to remain the user plane connection while rolling back to source DU due to F1 handover failure

Handle SIGINT and mark any subsequent steps as failed. Receiving SIGINT
a second time will abort the script immediately (as is the case before
this commit).

Note that Python seems to relay the signal to the "controlled" process
(e.g., Ping), which would return immediately with an error. So some
steps like Ping will abort immediately, others (e.g., IdleSleep) will
finish their step, and then the present logic will mark subsequent steps
as failed.

move all antennas comon code of begining of nr_pdcch_channel_estimation to prepare the future move of the antenna loop above the serial call of functions to decode pdcch

fix bugs in scope for pdcch, and optimize cpu cost of pdcch decoding by not processing useless samples in one symbol

"or None" would assign if the first term is false-y. But not specifying
it would already lead to the variable being set to None.

All XML steps take a single node. We can thus "centralize" reading this
parameter in the main loop and pass it to ExecuteActionWithParam().

Some CI tasks/commands like Iperf(), Ping() get multiple nodes (via XML
parameter "nodes") to potentially run UEs on different nodes (hosts) at
the same time. However, I argue that this is not good:

- we don't actually use this -- where we specify multiple UEs, it's
  always "localhost localhost..."
- it is inconsistent, as we typically have a single "node", not nodes,
  and there is a possibility to harmonize (see also next commit)
- if we needed it, there would be better ways to achieve the same.
  First, for hardware-based UEs, the ci_infra.yaml can specify different
  UEs. For simulated UEs, it would be feasible to have multiple XML
  steps run in parallel, e.g., in the XML <parallel> tag, which would
  clarify that multiple UEs on different hosts run in parallel
- it reduces code.

Hence, make a single <node> for these XML steps.

Created Jenkinsfiles:
- Jenkinsfile: for stadard test pipelines
- Jenkinsfile-oc: for deployments with OC

These 2 Jenkinsfiles covers all current test pipelines.