(CI): Test PDU session re-establishment when already connected UE
At the gNB side it is possible because of some event there is another PDU session re-establishment request. In this case SMF re-creates the PDU session and UPF shares the new tunnel ID. When UE tries to reach the external world. UPF sends the UE return packet to gNB with an old tunnel ID.
In CI we need to add a test to make this happen all the time.