Add vrtsim CI testcase with channel modelling.

In perfrom_channel_modelling, do convolution in batches which allows
vrtsim to write the channel samples as they are being produced instead
of waiting for the last sample in the slot to be ready.

Limit sample history to 256 samples and copy it into each channel modelling
task instead of relying on globally available buffer. This simplifies the code
and addressing into the saved samples buffer as well as enabling further
optimizations without sacrificing thread safety.

Integration `2025.w50`

* !3638 NR UE: calculate TA based on SIB19 information in NTN mode, if autonomous TA is not enabled
* !3624 NR UE: improve handling of Handover procedures
* !3807 doc: Update doc for IF setup
* !3741 Update documenation for handover
* !3798 Fix for computation of PRACH occasions and association period
* !3808 Add symbol timing functions for NR_DL_FRAME_PARMS + optimization for slot timing counterparts

Closes #981

See merge request oai/openairinterface5g!3806

Add symbol timing functions for NR_DL_FRAME_PARMS + optimization for slot timing
counterparts

Add two new functions for calculation symbol timestamp and symbol duration for
NR_DL_FRAME_PARMS. Also includes an optimization focused on removing
inefficiencies related slot-related counterparts.

For 15kHz SCS, symbols with index 0 and 7 have longer cyclic prefix.
This is now fixed in frame parms struct.

1. Removed function pointers for functions get_samples_per_slot(),
   get_samples_slot_timestamp() and get_slot_from_timestamp() as it does
   not offer any advantage. The functions are now called directly from
   everywhere.
2. Optimized these functions by removing loops where ever possible.

Fix for computation of PRACH occasions and association period

Update documenation for handover

Update documentation for handover to include the changes that were made after
upgrading the CI handover setup (attenuator, USRPs synchronization)

doc: Update doc for IF setup

Update IF setup doc, clarify how to set if_freq with large value in the gNB
configuration file. Per the libconfig manual, 64-bit integers are represented
like regular integers but require an appended "L"
(https://www.hyperrealm.com/libconfig/libconfig_manual.html#g_t64_002dbit-Integer-Values).

Update documenation for F1 handover to include the changes that were made after upgarding the CI handover setup (attenuator, USRPs synchronization)

NR UE: calculate TA based on SIB19 information in NTN mode, if autonomous TA is not enabled

To achieve the goal, the hyper frame number (HFN) is introduced at the NR UE
PHY, MAC and RRC layers.

Besides this, we also implemented an orbit propagation to improve the accuracy
of N_UE_TA_adj, and a fix to keep the N_TA from RAR and MAC CE.

Fixes #981

Integration `2025.w49`/`v2.4`

* !3786 Consistently use OAI_RNGSEED env variable for RNG
* !3758 Add yq to edit yaml files and add yaml-dev library in containers missing it
* Fix RFemulator noise device RNG initialization
* !3780 NGAP: fix PDU Session Release Response
* !3795 Increase Aerial-based L2 test core number
* !3794 Fix missing E2SM-RC message forward
* !3660 Fixes for BWP switching
* !3797 Fix FAPI WLS timing, UL counter, doc
* release notes v2.4

See merge request oai/openairinterface5g!3792

Add two new functions for calculation symbol timestamp and symbol
duration for NR_DL_FRAME_PARMS. These functions are not using
the existing indirection mechanism via function pointers as this
prevents the compiler from properly optimizing the code.

Merge remote-tracking branch 'origin/fapi-wls-fixes-timing-counter-doc' into integration_2025_w49 (!3797)

Fix FAPI WLS timing, UL counter, doc

- Fix FAPI WLS timing
- Fix periodical PNF UL throughput logs
- Update documentation to better explain how to run WLS with radio (USRP
  B210)

Fixes for BWP switching

This MR fixes some issues when performing BWP switching via
reconfiguration. It also adds a CI test for BWP switching.  # Please
enter a commit message to explain why this merge is necessary,

In all cases (CFRA in SA for HO, or CFRA in NSA/do-ra for access), the
UE has the full configuration already. We can therefore directly switch
to a dedicated search space, as it is already known to the UE.

Trigger various BWP switches through telnet, and test traffic after each
switch.

... so if we want to have 1 BWP configured at any given time we need to
reconfigure BWP 1 every time. This means that since the gNB has more
than 1 BWPs (for use for different UEs), that there is a "gNB BWP ID"
(as used by the gNB), which can be any BWP ID X, and one "UE BWP ID",
which is always 1. This commit implements this distinction.

Return from triggering reconfiguration with BWP switch if BWP is the
same as before the switch, and add check to verify if BWP triggered by
switch command exists