Merge remote-tracking branch 'origin/prevent-p7-msg-after-stop-indication' into integration_2026_w05 (!3880)

Prevent the PNF from sending P7 messages after sending a STOP.indication

Upon stopping the PNF, when sending the STOP.indication to the VNF, set
pnf_p7->terminate to 1.

Add a check on the PNF P7 send functions to not send a message after
pnf_p7->terminate is set.

This prevents the PNF from sending SLOT.indications after stopping,
which sometimes was causing the VNF to process a SLOT.indication after
it had received the indication to STOP.

Also, this MR adds a sanity check on the VNF P7 message handler to
ignore any P7 messages it receives after having it's own terminate flag
set to 1

This MR closes issue #1045

nfapi/oai_integration/nfapi_pnf.c

@@ -1800,6 +1800,9 @@ int nr_stop_request(nfapi_pnf_config_t *config, nfapi_pnf_phy_config_t *phy, nfa
                                          .header.phy_id = req->header.phy_id};
   nfapi_nr_stop_indication(config, &resp);
   has_sent_stop_ind = true;
+  // Upon sending the STOP.indication mark P7 PNF to terminate, to not send any further messages to the VNF
+  pnf_p7_t *pnf_p7 = (pnf_p7_t *)(p7_config_g);
+  pnf_p7->terminate = 1;
 #ifdef ENABLE_WLS
   wls_pnf_close(pnf_p5_init_and_receive_pthread);
 #endif