OpenAPI specs v239.92.8

OpenAPI specs from chat release v239.92.8.

• [CHA-6390] Run europe-west4 c3 chat-api on v239.92.7 (PR: #19607, Author: @Loschcode)
• [CHA-5958] Tiered chat history window (Factorial PREPROD + QA apps) (PR: #19007, Author: @slavabobik)
• [CHA-5658] Enable engagement ingestion on us-east4 kalshi (PR: #19605, Author: @ianb-gs)
• [INF-2358] Stop CDN dual-write to S3 in europe-west2 (PR: #19603, Author: @guruwinderrishi)
• [INF-2349] Downsize europe-west2:c1 CNPG and retire its CloudSQL (PR: #19606, Author: @guruwinderrishi)
• [AI-1616] Fork agent channels: newest page inline, history backfilled (PR: #19536, Author: @Loschcode)
• [VID-1524] Enable video coordinator metric tag configurations (PR: #19608, Author: @razkevich)
• [VID-1676] update video to v239.92.6 (PR: #19611, Author: @vagruchi)
• [CHA-6283] Run europe-west4 c1 chat-api and workers on v239.92.7 (PR: #19617, Author: @nijeesh-stream)
• [INF-2349] Run europe-west2:c1 ws on v239.92.3 (PR: #19618, Author: @guruwinderrishi)
• [INF-2030] Expire wsstats buckets after three intervals (PR: #19554, Author: @razkevich)
• [INF-2030] Read unread cell triples with HMGET per user (PR: #19461, Author: @razkevich)
• [INF-2350] Downsize us-east4:sirius CNPG and retire its CloudSQL (PR: #19619, Author: @mz026)
• [FEEDS-2154] Add app-wide proximity located set, store and build queries (PR: #19512, Author: @JimmyPettersson85)
• [MOD2-1630] Roll c3 and c19 to v239.92.5 and batch label results (PR: #19620, Author: @kmitrovv)
• Release v239.92.8 (PR: #19621, Author: @stream-ci-bot)