Merge remote-tracking branch 'origin/reject_UE' into integration_2025_w27 (!3432)

NR RRC Reject UE

Improvements in procedures to handle RRCReject message both at gNB and
UE. At gNB we send RRC Reject if the UE cannot be given resources to go
into connected mode.

openair2/COMMON/rrc_messages_types.h

@@ -486,6 +486,7 @@ typedef struct {
 typedef struct {
   NR_BCCH_BCH_Message_t *bcch;
   int get_sib;
+  bool access_barred;
 } nr_mac_rrc_config_mib_t;
 typedef struct {
   NR_SIB1_t *sib1;