WPB-27255: move email sending to background-worker - #5448
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Rework of the email background-worker move: brig now inserts send-email jobs into the new `emails` Arbiter queue (PostgreSQL, default Arbiter schema) instead of publishing BackgroundJobSendEmail messages to the RabbitMQ `background-jobs` queue. - Wire.API.Jobs: new `emails` queue with EmailsJobPayload/SendEmailJobPayload (request id + SerializableMail), added to JobRegistry; the RabbitMQ BackgroundJobPayload loses its send-email variant and the SendEmailJob wrapper type is dropped. - Wire.EmailSending.Queueing: the EmailSending interpreter now runs ArbiterCore.insertJob against the shared hasql pool (self-contained, Embed IO only; maxAttempts = 3). - brig: wires the Arbiter-backed interpreter and runs the Arbiter job migrations at startup, mirroring galley. - background-worker: new emails worker pool (Wire.EmailJobsWorker) sends the mail via the configured SES/SMTP transport; malformed payloads are rejected with a warning, send failures rethrow as retryable so Arbiter retry/backoff and the DLQ apply. The RabbitMQ runner's email handling and its exception wrapper are reverted. - docs/changelog updated for the Arbiter semantics, including rollout ordering and the at-rest sensitivity of the emails/DLQ tables.
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https://wearezeta.atlassian.net/browse/WPB-27255
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changelog.d