make pg datastore continuously checkpoint using a revision heartbeat #6818

Job	Run time
paths-filter	7s
Integration Tests	3m 54s
Unit	4m 58s
Build Binary & Image	4m 28s
Datastore Consistency Tests (crdb)	1m 57s
Datastore Integration Tests (crdb)	7m 49s
Datastore Consistency Tests (mysql)	2m 48s
Datastore Integration Tests (mysql)	2m 16s
Datastore Consistency Tests (spanner)	2m 14s
Steelthread	3m 0s
Datastore Integration Tests (spanner)	2m 11s
Datastore Integration Tests (postgres, 13.8)	3m 1s
Datastore Integration Tests (postgres, 14)	3m 10s
Datastore Integration Tests (postgres, 15)	3m 12s
Analyzers Unit Tests	1m 0s
WASM Tests	1m 44s
Datastore Integration Tests (postgres, 16)	3m 43s
Datastore Integration Tests (postgres, 17)	3m 52s
Datastore Integration Tests (pgbouncer, 13.8)	3m 46s
E2E	2m 50s
Datastore Consistency Tests (postgres, 13.8)	2m 1s
Datastore Integration Tests (pgbouncer, 14)	4m 35s
Datastore Consistency Tests (postgres, 14)	2m 22s
Datastore Integration Tests (pgbouncer, 15)	3m 53s
Datastore Consistency Tests (postgres, 15)	2m 4s
Datastore Integration Tests (pgbouncer, 16)	3m 16s
Datastore Consistency Tests (postgres, 16)	2m 2s
Generate Protobufs	0s
Datastore Integration Tests (pgbouncer, 17)	3m 37s
Datastore Consistency Tests (postgres, 17)	2m 18s
	1h 28m 8s

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