Fixes for Initial UE Context Setup

Guido Casatirequested to merge
fixes-initial-context-setup into develop

This MR fixes DRB aggregation from E1 so DRBs from multiple PDU sessions are appended correctly into the F1 DRB array instead of overwriting existing entries. It also makes NGAP Initial Context Setup skip PDU sessions that are already established for the UE, only setting up new sessions.

DRB aggregation from E1: Adjust fill_drb_to_be_setup_from_e1_resp to pass &drbs[nb_drb] into fill_f1_drbs_from_e1, ensuring DRBs from later PDU sessions are appended after the current count.

Duplicate PDU sessions in NGAP Initial Context Setup: In rrc_gNB_process_NGAP_INITIAL_CONTEXT_SETUP_REQ, detect requested PDU session IDs that already exist with PDU_SESSION_STATUS_ESTABLISHED, log a warning, and skip them so they are not added to UE->initial_pdus.

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