[service] Remove stable service.disableOpenCensusBridge gate (#11009) #22320

Job	Run time
setup-environment	8s
govulncheck	36s
unittest-matrix (ubuntu-latest, ~1.23)	2m 32s
test-coverage	6m 9s
unittest-matrix (ubuntu-latest, ~1.22)	2m 23s
checks	1m 58s
cross-build-collector (darwin, amd64)	37s
lint	3m 33s
cross-build-collector (darwin, arm64)	57s
cross-build-collector (linux, 386)	38s
cross-build-collector (linux, amd64)	47s
cross-build-collector (linux, arm64)	41s
cross-build-collector (linux, ppc64le)	40s
cross-build-collector (linux, arm, 7)	36s
cross-build-collector (linux, s390x)	39s
cross-build-collector (windows, 386)	39s
cross-build-collector (windows, amd64)	46s
unittest	1s
	24m 20s

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