OpenAPI specs v240.5.2

OpenAPI specs from chat release v240.5.2.

• [INF-2030] Move fanduel Valkey onto the shared us-east4 pool c (PR: #20147, Author: @razkevich)
• [INF-2030] Move on24 Valkey onto the shared us-east4 pool c (PR: #20148, Author: @razkevich)
• [INF-2399] Cut us-east4:c1 over from CloudSQL to CNPG (PR: #20169, Author: @guruwinderrishi)
• [INF-2030] Move c22 Valkey onto redis-shared-a (PR: #20168, Author: @mogita)
• [MOD2-1533] Enable escalation queue by default (PR: #20082, Author: @viktorapo808)
• [INF-2030] Move c15 Valkey onto the shared us-east4 pool c (PR: #20149, Author: @razkevich)
• [FEEDS-2198] Bump us-east4:c14 chat and chat-manager to v240.5.0 (PR: #20171, Author: @JimmyPettersson85)
• [VID-1692] Return 404 with a reason for missing participant sessions (PR: #19895, Author: @atoppi)
• [FEEDS-2056] Add feed impressions and For You exploration slot (PR: #19612, Author: @naumoskajana)
• [INF-2400] Stand up CNPG cluster for us-west1:c3 (pools + postgres.yaml) (PR: #20178, Author: @guruwinderrishi)
• [CHA-6459] Dual-write last_message_at for Milanuncios (PR: #20142, Author: @mogita)
• [CHA-5658] Raise europe-west4 ClickHouse to 12 CPU and 24/32Gi for engagement stats (PR: #20173, Author: @ianb-gs)
• [CHA-6493] Keep whale usage meters landing and decouple message discovery from the users meter (PR: #20163, Author: @Loschcode)
• [CHA-5658] Mint analytics_id for users created by imports (PR: #20174, Author: @ianb-gs)
• Release v240.5.2 (PR: #20182, Author: @stream-ci-bot)