WPB-22954: migrate mls-commit-locks to PostGreSQL - #5415
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Migrate the MLS commit-lock store (galley) from Cassandra to PostgreSQL using the dual-write + background-worker pattern, following the CodeStore recipe. The Postgres acquire replicates Cassandra's IF NOT EXISTS USING TTL via INSERT ... ON CONFLICT DO UPDATE WHERE expires_at < now() RETURNING, honoring both CAS mutual exclusion and TTL expiry (a pure DO NOTHING would leave an expired lock blocking its (group_id, epoch) forever, since Postgres has no TTL reaper). Adds Postgres/DualWrite/Migration interpreters, a migration flag + metrics, helm/config/docs wiring, schema migration, and an integration test.
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https://wearezeta.atlassian.net/browse/WPB-22954
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