Merge remote-tracking branch 'origin/ITTI_msg_leak' into integration_2025_w08 (!3263)

Free ITTI message after receiving it at MAC from RRC

Sanitize reporting the following leaks. This small commit seems to fix them.

```
Direct leak of 9888 byte(s) in 103 object(s) allocated from:
    #0 0x7fea59b60a06 in __interceptor_calloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cc:153
    #1 0x556dd89473e7 in itti_malloc /home/francesco/openairinterface5g/common/utils/ocp_itti/intertask_interface.cpp:64
    #2 0x556dd8947b76 in itti_alloc_new_message /home/francesco/openairinterface5g/common/utils/ocp_itti/intertask_interface.cpp:93
    #3 0x556dd87100a1 in nr_rrc_ue_decode_NR_BCCH_BCH_Message /home/francesco/openairinterface5g/openair2/RRC/NR_UE/rrc_UE.c:858
    #4 0x556dd87100a1 in rrc_nrue /home/francesco/openairinterface5g/openair2/RRC/NR_UE/rrc_UE.c:2013
    #5 0x556dd871392e in rrc_nrue_task /home/francesco/openairinterface5g/openair2/RRC/NR_UE/rrc_UE.c:1943
    #6 0x7fea59a16608 in start_thread /build/glibc-FcRMwW/glibc-2.31/nptl/pthread_create.c:477

Direct leak of 96 byte(s) in 1 object(s) allocated from:
    #0 0x7fea59b60a06 in __interceptor_calloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cc:153
    #1 0x556dd89473e7 in itti_malloc /home/francesco/openairinterface5g/common/utils/ocp_itti/intertask_interface.cpp:64
    #2 0x556dd8947b76 in itti_alloc_new_message /home/francesco/openairinterface5g/common/utils/ocp_itti/intertask_interface.cpp:93
    #3 0x556dd86d707c in nr_rrc_ue_process_masterCellGroup /home/francesco/openairinterface5g/openair2/RRC/NR_UE/rrc_UE.c:1094
    #4 0x556dd86faed9 in nr_rrc_process_rrcsetup /home/francesco/openairinterface5g/openair2/RRC/NR_UE/rrc_UE.c:1138
    #5 0x556dd86faed9 in nr_rrc_ue_decode_ccch /home/francesco/openairinterface5g/openair2/RRC/NR_UE/rrc_UE.c:1200
    #6 0x556dd870a518 in rrc_nrue /home/francesco/openairinterface5g/openair2/RRC/NR_UE/rrc_UE.c:2028
    #7 0x556dd871392e in rrc_nrue_task /home/francesco/openairinterface5g/openair2/RRC/NR_UE/rrc_UE.c:1943
    #8 0x7fea59a16608 in start_thread /build/glibc-FcRMwW/glibc-2.31/nptl/pthread_create.c:477

Direct leak of 88 byte(s) in 1 object(s) allocated from:
    #0 0x7fea59b60a06 in __interceptor_calloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cc:153
    #1 0x556dd89473e7 in itti_malloc /home/francesco/openairinterface5g/common/utils/ocp_itti/intertask_interface.cpp:64
    #2 0x556dd8947b76 in itti_alloc_new_message /home/francesco/openairinterface5g/common/utils/ocp_itti/intertask_interface.cpp:93
    #3 0x556dd86be183 in nr_rrc_process_sib1 /home/francesco/openairinterface5g/openair2/RRC/NR_UE/rrc_UE.c:337
    #4 0x556dd870c3b3 in nr_rrc_ue_decode_NR_BCCH_DL_SCH_Message /home/francesco/openairinterface5g/openair2/RRC/NR_UE/rrc_UE.c:954
    #5 0x556dd870c3b3 in rrc_nrue /home/francesco/openairinterface5g/openair2/RRC/NR_UE/rrc_UE.c:2015
    #6 0x556dd871392e in rrc_nrue_task /home/francesco/openairinterface5g/openair2/RRC/NR_UE/rrc_UE.c:1943
    #7 0x7fea59a16608 in start_thread /build/glibc-FcRMwW/glibc-2.31/nptl/pthread_create.c:477
```

openair2/RRC/NR_UE/L2_interface_ue.c

@@ -149,6 +149,7 @@ void process_msg_rcc_to_mac(MessageDef *msg)
     default:
       LOG_E(NR_MAC, "Unexpected msg from RRC: %d\n", ITTI_MSG_ID(msg));
   }
+  itti_free(ITTI_MSG_ORIGIN_ID(msg), msg);
 }
 
 void nr_mac_rrc_inactivity_timer_ind(const module_id_t mod_id)