UE-requested QoS/GBR change (#22 Increment 6)

[next-nf]

Handles a Bearer Resource Command with TAD operation no_tft_operation — a UE-requested QoS/GBR change on a dedicated bearer (#22 Increment 6, the last #22 piece), on the whole-pipeline async invoke foundation (#48).

The requested QoS is reported to the PCRF via a Gx CCR-U carrying QoS-Information (no filter change); the PCRF re-installs the bearer's rule with the authorized QoS; the PGW emits a PTI-echoing Update Bearer Request carrying the new Bearer QoS. On rejection → Bearer Resource Failure Indication.

Only two pieces of new production code — a no_tft_operation dispatch arm and ue_qos_change_proc/4. The Gx QoS-Information encoding (smf_aaa_gx:from_session → qos_from_session/1), the outcome path (ue_update_outcome: PFCP modify + Update Bearer with new Bearer QoS), and the error path are all reused from Inc2–5.

• pgw_SUITE e2e proves the Update Bearer carries the PCRF-authorized GBR (UE requests 2000 kbps, PCRF authorizes 3000, assert 3000) with the PTI, and that no Create/Delete Bearer is sent
• diameter_Gx_SUITE wire round-trip for the QoS-Information CCR-U encoding
• pgw_SUITE 133/133, diameter_Gx_SUITE 10/10

Stacked on #56. Completes the #22 increment series (create/delete/add/replace/QoS); the PCRF-Result-Code reject e2e remains deferred behind #50.