Merge remote-tracking branch 'origin/remove_l2_sim' into integration_2025_w42 (!3686)

Remove NR L2 simulator code from UE

This MR removes NR (SA and NSA) L2 simulator from the codebase. The code, at
least at the UE side, was done at a time where there was no clear L2/L1 split
leading to a complex implementation that never worked as expected. The L2
simulator has been broken and removed from testing for long time and, once it
needs to be revived, it would require a complete new implementation.

common/utils/ocp_itti/intertask_interface.h

@@ -321,8 +321,6 @@ typedef struct {
   TASK_DEF(TASK_DU_F1, 200)           \
   TASK_DEF(TASK_CUCP_E1, 200)         \
   TASK_DEF(TASK_CUUP_E1, 200)         \
-  TASK_DEF(TASK_RRC_NSA_UE, 200)      \
-  TASK_DEF(TASK_RRC_NSA_NRUE, 200)    \
   TASK_DEF(TASK_NAS_NRUE, 200)        \
   TASK_DEF(TASK_MAX, 200)