Merge branch 'integration_2023_w13' into 'develop'

integration_2023_w13

See merge request oai/openairinterface5g!2037

* !1945 Free RNTI related structures at PHY after UE disconnection
* !2011 Creation of new pipeline LTE-TDD-2x2-container
* !1854 Handle reconfigurationWithSync
* !2019 bugfix: LDPC decoding in the gNB: clear d properly
* !2038 Fix DL 2x2 errors
* !2039 Adding test-case in XML to reset USRP in LTE-TDD pipeline
* !2008 Implement NR-UE Deregistration procedure
* !2023 Rework PDCP OAI API to allow custom SRB data forwarding (e.g., in F1)
* !2015 Update documentation: CI, general README.md, overview of doc README, various improvements