make pg datastore continuously checkpoint using a revision heartbeat #6813

Job	Run time
paths-filter	5s
Steelthread	3m 32s
Integration Tests	3m 39s
Build Binary & Image	4m 31s
Datastore Consistency Tests (crdb)	3m 5s
Datastore Integration Tests (crdb)	8m 11s
Datastore Consistency Tests (mysql)	3m 1s
Datastore Integration Tests (mysql)	2m 14s
Datastore Consistency Tests (spanner)	2m 21s
Datastore Consistency Tests (postgres, 13.8)	1m 40s
Datastore Integration Tests (spanner)	1m 55s
Datastore Integration Tests (postgres, 13.8)	3m 17s
Datastore Consistency Tests (postgres, 14)	2m 5s
Datastore Consistency Tests (postgres, 15)	2m 14s
Datastore Integration Tests (postgres, 14)	3m 48s
Unit	5m 13s
Datastore Integration Tests (postgres, 15)	4m 12s
Datastore Consistency Tests (postgres, 16)	2m 41s
Analyzers Unit Tests	46s
Datastore Consistency Tests (postgres, 17)	2m 2s
Datastore Integration Tests (postgres, 16)	5m 49s
WASM Tests	1m 32s
Datastore Integration Tests (postgres, 17)	2m 35s
Datastore Integration Tests (pgbouncer, 13.8)	3m 30s
E2E	8m 3s
Datastore Integration Tests (pgbouncer, 14)	4m 28s
Generate Protobufs	0s
Datastore Integration Tests (pgbouncer, 15)	2m 53s
Datastore Integration Tests (pgbouncer, 16)	3m 16s
Datastore Integration Tests (pgbouncer, 17)	3m 41s
	1h 36m 19s

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