WPB-22955: migrate mls-proposal-refs to PostGreSQL - #5411
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Migrate the Wire.ProposalStore (MLS pending proposal refs, table mls_proposal_refs) from Cassandra to PostgreSQL using the dual-write + background-worker cutover pattern, mirroring Wire.CodeStore. Adds Postgres + DualWrite interpreters selected at startup by postgresMigration.proposals, a TTL-preserving backfill loop in the background worker, the SQL migration + regenerated postgres-schema.sql, helm/gotmpl/docs config, and an integration test driving the cassandra -> migration-to-postgresql -> postgresql lifecycle. Roundtrip properties cover the ProposalRef/ProposalOrigin/RawMLS Proposal marshall instances.
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https://wearezeta.atlassian.net/browse/WPB-22955
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