health, grpc: Deliver health service updates through the health listener #13063

Job	Run time
vet-proto	20s
tests (vet, 1.22)	2m 4s
tests (extras, 1.23)	2m 49s
tests (tests, 1.23)	4m 4s
tests (tests, 1.23, -race)	5m 46s
tests (tests, 1.23, 386)	4m 43s
tests (tests, 1.23, arm64)	6m 40s
tests (tests, 1.22)	4m 0s
tests (tests, 1.23, -race, GRPC_EXPERIMENTAL_ENABLE_NEW_PICK_FIRST=true)	5m 32s
	35m 58s

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