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.

openair2/LAYER2/NR_MAC_COMMON/nr_mac.h

@@ -320,35 +320,6 @@ typedef struct {
   uint8_t nbits;
 } dci_field_t;
 
-typedef struct {
-  /* The active harq sfn/slot field was created to save the
-     scheduled SFN/Slot transmission for the ACK/NAK. If we
-     do not save it, then we have to calculate it again as the
-     NRUE MAC layer already does in get_downlink_ack(). */
-  int active_dl_harq_sfn;
-  int active_dl_harq_slot;
-  int active_ul_harq_sfn;
-  int active_ul_harq_slot;
-  bool active;
-} emul_l1_harq_t;
-
-typedef struct {
-  bool expected_sib;
-  bool index_has_sib[NR_MAX_HARQ_PROCESSES];
-  bool expected_rar;
-  bool index_has_rar[NR_MAX_HARQ_PROCESSES];
-  bool expected_dci;
-  bool index_has_dci[NR_MAX_HARQ_PROCESSES];
-  emul_l1_harq_t harq[NR_MAX_HARQ_PROCESSES];
-  int active_uci_sfn_slot;
-  int num_srs;
-  int num_harqs;
-  int num_csi_reports;
-  uint8_t pmi;
-  uint8_t ri;
-  uint8_t cqi;
-} nr_emulated_l1_t;
-
 typedef struct {
 
   uint8_t     format_indicator; //1 bit