Introduce HTTP2 health check transport options #15972

Job	Run time
setup-environment	15s
govulncheck	36s
lint	3m 5s
test-coverage	2m 28s
unittest-matrix (~1.21.5)	1m 38s
cross-build-collector (darwin, amd64)	42s
unittest-matrix (~1.20.12)	1m 13s
checks	1m 40s
cross-build-collector (darwin, arm64)	46s
cross-build-collector (linux, 386)	41s
cross-build-collector (linux, amd64)	47s
cross-build-collector (linux, arm64)	48s
cross-build-collector (linux, ppc64le)	47s
cross-build-collector (linux, arm, 7)	40s
cross-build-collector (linux, s390x)	40s
cross-build-collector (windows, 386)	51s
cross-build-collector (windows, amd64)	46s
unittest	1s
	18m 24s

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