Fix postgres schema after dropping old tables (#16730)

changelog.d/16730.misc

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+Add a Postgres `REPLICA IDENTITY` to tables that do not have an implicit one. This should allow use of Postgres logical replication.

synapse/storage/schema/main/delta/83/10_replica_identity_batch_events.sql.postgres

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-ALTER TABLE batch_events REPLICA IDENTITY USING INDEX chunk_events_event_id;

synapse/storage/schema/main/delta/83/10_replica_identity_event_txn_id.sql.postgres

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-ALTER TABLE event_txn_id REPLICA IDENTITY USING INDEX event_txn_id_event_id;

synapse/storage/schema/main/delta/83/10_replica_identity_insertion_event_edges.sql.postgres

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-ALTER TABLE insertion_event_edges REPLICA IDENTITY FULL;

synapse/storage/schema/main/delta/83/10_replica_identity_insertion_event_extremities.sql.postgres

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-ALTER TABLE insertion_event_extremities REPLICA IDENTITY USING INDEX insertion_event_extremities_event_id;

synapse/storage/schema/main/delta/83/10_replica_identity_insertion_events.sql.postgres

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-ALTER TABLE insertion_events REPLICA IDENTITY USING INDEX insertion_events_event_id;