Keeping track if AS security is activated. This is important for a later
commit, where we use this to decide if we send a F1 UE Context Setup Req
with security command after receiving the E1 bearer context setup
response. The corresponding AssertFatal() removed in the same commit
implementing PDU session handling in NGAP Initial UE Context Setup.

38.401 Sec 8.1 asks for sending the Initial Context Setup Response after
a reconfiguration happened. Therefore, we can never send this message
directly from the handler in the Initial Context Setup Request

Integration: 2024.w04

See merge request oai/openairinterface5g!2535

* !2522 Integration of O-RAN 7.2 FH using OSC xRAN library
* !2416 fix-ue-scheduler-multi-thread-storage-list-mutex-protection
* !2488 LDPC T2 card encoding: rate matching and interleaving on the T2 card
* !2497 Read NoS1 bearer configuration from gNB-generated file
* !2518 Extension of E1AP procedures
* !2533 This limits PUCCH payload to 11 bits, 7 CSI + 3 ACKNACK + 1 SR maximum.
* !2526 prepare MSG3 in advance at RRC UE
* !2451 MAC procedures to handle DLSCH allocation type 0
* !2525 NR UE fix for function to find PUCCH resource set
* !2536 Improve Precoding Matrix computation taking in consideration the DCI format
* some documentation+config file updates for 7.2
* !2501 Improvements for NR implementation of timers
* !2531 Fix unit test build and build unit tests in CI

- PUSCH target increase: lower PUSCH target requires !2373
- sdr_addrs is USRP-specific, not needed for O-RAN

Merge remote-tracking branch 'origin/NR_UE_dlsch_rescource_allocation_type0' into integration_2024_w04

Merge remote-tracking branch 'origin/NR_UE_prepare_msg3_payload_in_advance' into integration_2024_w04

Merge remote-tracking branch 'origin/NR_UE_reworking_NOS1_bearer_configuration' into integration_2024_w04

- UE and gNB encoder modification
- update T2 related doc

- cleanup of the UE encoder code
- support rate matching on the T2 card
- remove unused code

- Rate matching performed by card
- Due to rate matching on card, small TBs are encoded correctly, so the
  limitation of encoding small TBs in CPU can be lifted (all TBs encoded
  on T2), see a later commits

- provided insights on the messages flow with requests towards northbound

- new file:   /doc/dev_tools/sanitizers.md

- it triggers the RRC callback after SCTP SHUTDOWN indication
- CUUP entity cleanup at RRC level