OpenAPI specs v238.13.0

OpenAPI specs from chat release v238.13.0.

• [FEEDS-1905] Add oneshot to sync user custom fields from a JSON/JSONL file (PR: #17057, Author: @darkoatanasovski)
• [INF-1780] Runbook: reusing the e2e for another region, and a read-only verification skill (PR: #17025, Author: @razkevich)
• [INF-2052] Clean up the CDN migration documentation (PR: #16950, Author: @guruwinderrishi)
• [INF-1780] Add Sydney (australia-southeast1) to CDN billing (PR: #17093, Author: @razkevich)
• [CHA-4814] Denormalize channel name to avoid per-row channels probe in SU denorm (PR: #16379, Author: @ianb-gs)
• [SEC-2377] Record Incident Ledger subnet allocation and ownership (PR: #17089, Author: @peter-matkovski)
• [CHA-5323] Optimize VGen member search with blocking exclusion (PR: #17054, Author: @Loschcode)
• [INF-1780] Sydney storage: create_bigquery_table = true (PR: #17101, Author: @razkevich)
• [CHA-5034] Stop UserChannelUnreadSet manufacturing indexed-zero cells (PR: #16435, Author: @nijeesh-stream)
• [CHA-5313] Raise the WS Ordered queue drain rate for MyEdSpace (PR: #17046, Author: @slavabobik)
• [INF-1780] Document that a CDN billing region lands in one apply (PR: #17102, Author: @razkevich)
• [PLA-0] Bump feeds-traffic shards to v238.12.0 (PR: #17096, Author: @JimmyPettersson85)
• Release v238.13.0 (PR: #17105, Author: @stream-ci-bot)