AF resPrio/preemptCap/preemptVuln in MediaComponent now update the
ARP of the PCC rule and the SMF modifies the QoS flow when only the
ARP has changed.
- resPrio is mapped through the new pcf.reservation_priorities config
(no standard mapping); an unmapped resPrio leaves the priority level
unchanged and is logged.
- preemptCap/preemptVuln are applied directly.
- An update whose media component carries only ARP keeps the bitrates
negotiated so far. This is decided by field presence on the parsed
MediaComponentRm, so an unmapped resPrio or "0 bps" is handled.
Related PR: #4793