Integration: 2023.w51

• !2221 (merged) NR UE going to IDLE state
• !2464 (merged) move common .h file in common directory, remove mem_block_t
• !2479 (merged) CI: test with 2 UL layers in AW2S pipeline
• !2468 (merged) LDPC T2 card: fix and doc update
• !2480 (merged) Enabling multi-ue support in the open-source L2 proxy
• !2476 (merged) Fixes for multi-DU/CU-UP and CI test