- create function to find free RA process
- reorganize function to put Msg1 related processing first, Msg2 second

Before this commit, there was data that was not initialized, resulting
in Msg2 remaining unscheduled.

Integration `2024.w13`

Closes #696 and #762

See merge request oai/openairinterface5g!2653

* !1911 Preparatory work for NR DL 4-layer MIMO at gNB
* !2610 fix ug on pilot 2 in nr_pbch_dmrs_correlation() that is lacking signal...
* !2639 NR gNB PUCCH2 CQI workaround
* !2642 NR UE demoting to LOG_D another log that cause flooding
* !2644 NR UE prevent segfault at detach
* !2645 add error code for pdu session reject in the ue
* !2600 Handle Msg3 with SRB1 RRCReestablishmentComplete and MAC CE C-RNTI
* trigger RF-sim E1+F1 test without asan
* !2636 Fix various F1 problems
* !2641 NR DL and UL channel estimation fix
* !2652 Provide additional troubleshooting documentation for QtScope
* !2646 NRUE fix asn_sequence_del to clear a list
* !2504 CI: use iperf3, refactor Iperf_Module
* !2617 use UE ID instead of RNTI internally in NR RLC
* !2619 Minor PDCP fixes
* !2648 Minor CI fixes, stack protection, fix E1+F1 Quectel test, L2sim5G test

Merge remote-tracking branch 'origin/NR_UE_fix_wrong_use_asn_sequence_del' into integration_2024_w13

Merge remote-tracking branch 'origin/NR_fix_layer_port_confusion_channel_estimates' into integration_2024_w13

Merge remote-tracking branch 'origin/Fix_Msg3_RRCReestablishmentComplete_with_C-RNTI' into integration_2024_w13

Merge remote-tracking branch 'origin/demote_another_log_printed_too_many_times' into integration_2024_w13

On Wayland (e.g., Gnome on Ubuntu 22), additional steps might be
necessary to make QtScope run. Describe them in the doc.

Closes: #696

- this prevents pulling PDUs from PDCP when re-establishment is awaiting

- short and long SN sizes
- PDCP PDU header sizes
- PDCP integrity size
- getter for maximim PDCP PDU size

From 3GPP TS 38.321 Section 5.4.3 Multiplexing and assembly, we need to process the highest priority subPDUs first:
- MAC CE for C-RNTI is the one with higher priority

38.473 section 8.2.3.1 says that upon F1 Setup Request, UE associated
signalling should be erased. In this commit, we trigger a release of all
UEs that were still connected to a DU when we received the SCTP
shutdown, i.e., when the DU disconnects.

Closes #762

Explanations: see #706. TLDR: the RRC code calls nr_pdcp_remove_ue(), so
we should not call it in the E1 handler if we do not use split mode.

5G L2sim is broken since some time, and there is no time to fix it.
Remove it from the Container Parent Pipeline.

- Four mounting of files, we need the absolute path. Even if the script
  gets relative paths, realpath will give the absolute path
- Correctly recognize and handle gNB images with AW2S support

- no need to specify "single-ue" profile when running iperf test for 1 UE only
- default profile "balanced" can be used instead, computes BW for 1 UE correctly