OpenAPI specs v239.13.0

OpenAPI specs from chat release v239.13.0.

• [FEEDS-1937] Support nested custom.data.* fields in ranking expressions (PR: #17358, Author: @JimmyPettersson85)
• [FEEDS-1937] Fix fake import path in ranking tests (PR: #17393, Author: @JimmyPettersson85)
• [INF-2115] Arm dual-write on europe-west4 c12 at 100% (PR: #17392, Author: @guruwinderrishi)
• [CHA-5377] Remove Hawaya super-likes oneshot (PR: #17396, Author: @Acconut)
• [INF-2115] Record europe-west4 c12 armed at 100% in the migration state (PR: #17400, Author: @guruwinderrishi)
• [CHA-5552] Increase c12 AlloyDB WAL budget (PR: #17379, Author: @thesyncim)
• [CHA-3447] Add EndpointPath.custom to Swift endpoints (PR: #17394, Author: @laevandus)
• [CHA-5591] Make every eligible alert ackable, and give infra its firefighting channel (PR: #17403, Author: @Loschcode)
• [MOD2-430] Create rule to block users creating too many channels (PR: #17052, Author: @viktorapo808)
• [CHA-5555] Ungroup the TiKV monitors that strand No-Data groups (PR: #17401, Author: @razkevich)
• [INF-2015] Migrate asia-south1 to Cloud CDN + GCS (PR: #17364, Author: @guruwinderrishi)
• [CHA-5532][flaky-fix] Wait for the probe worker's degraded flag instead of sleeping (PR: #17239, Author: @adityaalifn)
• [CHA-5591] Let every team use the ownable tier, not just chat (PR: #17407, Author: @Loschcode)
• [INF-2094] Add the us-east4:polymarket shard configuration (PR: #17357, Author: @razkevich)
• [CHA-5605] Fix nil data map panic in FCM push template rendering (PR: #17405, Author: @hifaizsk)
• Release v239.13.0 (PR: #17412, Author: @stream-ci-bot)