OpenAPI specs v238.3.0

OpenAPI specs from chat release v238.3.0.

• [CHA-0] Delete uploaded objects in the churn teardown cron (PR: #16845, Author: @adityaalifn)
• [INF-1978] Add the temporary Arm pool for the redis-c10 swap (PR: #16888, Author: @mogita)
• [INF-2034] Move CNPG config reasoning out of comments into pg-guide and pg_day_two (PR: #16821, Author: @mz026)
• [CHA-5165] Reconcile the health-rollup credential after the worker chart rolls (PR: #16584, Author: @hifaizsk)
• [CHA-5247] Keep ordinary member-name searches correlated (PR: #16858, Author: @Loschcode)
• [CHA-5112] Keep the complete stream-envoy request log by default (PR: #16887, Author: @mogita)
• [INF-1780] Canada CDN billing on GCP, in one apply (PR: #16883, Author: @razkevich)
• [CHA-5217] Move remaining task packages out of monolith/tasks (PR: #16869, Author: @Acconut)
• [INF-1763] Init us-east5 c3 (PR: #16725, Author: @vagruchi)
• [FEEDS-1867] Oneshot: rebuild feed op-logs from PG activities (PR: #16648, Author: @JimmyPettersson85)
• [CHA-5086] Hide the message pager lower bound from the PG planner (PR: #16889, Author: @mogita)
• [INF-2038] Raise Prometheus memory on us-east4 and us-east5 (PR: #16904, Author: @tbarbugli)
• [CHA-5136] Dual-write last_message_at for bbc-prod (PR: #16905, Author: @kanat)
• [INF-2039] Align us-east5 shard images on v238.2.0 (PR: #16907, Author: @tbarbugli)
• [INF-2040] Reserve two more Cloud NAT egress IPs in us-east5 (PR: #16910, Author: @tbarbugli)
• [INF-2041] Expand us-east5 ClickHouse storage to 2Ti (PR: #16911, Author: @tbarbugli)
• Release v238.3.0 (PR: #16912, Author: @stream-ci-bot)