refactor: decouple Prometheus server in hstream-kafka #6511

Job	Run time
prepare pre-build environment for tests	33s
build-ghc-9.2.8	26m 33s
build-hstream-admin-store	2m 15s
integration-tests-9.2.8	19m 36s
integration-tests-rqlite-9.2.8	20m 14s
test-ghc-9.2.8	4m 27s
integration-tests-kafka-9.2.8	10m 40s
integration-tests-kafka-rqlite-9.2.8	12m 50s
deploy-to-minikube-ghc-${{ matrix.ghc }}	0s
distributed-tests-9.2.8	5m 6s
	1h 42m 14s

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