Home-Routed roaming: during Xn/N2 handover the source gNB may forward
remaining DL data to the core using UL PDU Session Information (PSC).
On the V-UPF the PSC was lost on the indirect path because OHR+OHC
removed the incoming GTP-U header (and its extensions) and we did not
recreate PSC when no QER/QFI was provisioned by the V-SMF.
This change makes the V-UPF rebuild a DL PSC for the target gNB even
when QER is absent, limited to the Access->Access indirect path
(source gNB -> V-UPF -> target gNB).
Why this is needed in HR:
- In HR deployments the V-SMF typically does not provision QER/QFI for
the temporary indirect path. Without recreating PSC from recvhdr, the
extension header disappears after OHR+OHC and the target gNB cannot
see the QFI during handover buffering/forwarding.
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