health, grpc: Deliver health service updates through the health liste… #13172

Job	Run time
vet-proto	20s
tests (vet, 1.22)	1m 58s
tests (extras, 1.23)	2m 49s
tests (tests, 1.23)	4m 20s
tests (tests, 1.23, -race)	5m 45s
tests (tests, 1.23, 386)	4m 50s
tests (tests, 1.23, arm64)	6m 35s
tests (tests, 1.22)	4m 16s
tests (tests, 1.23, -race, GRPC_EXPERIMENTAL_ENABLE_NEW_PICK_FIRST=true)	5m 38s
	36m 31s

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