kafka cpp server: improvements (#1765) #6666

Job	Run time
prepare pre-build environment for tests	15s
build-ghc-9.4.8	18m 50s
build-hstream-admin-store	1m 51s
test-ghc-9.4.8	4m 8s
integration-tests-9.4.8	20m 44s
deploy-to-minikube-ghc-${{ matrix.ghc }}	0s
integration-tests-rqlite-9.4.8	21m 19s
integration-tests-kafka-9.4.8	12m 8s
integration-tests-kafka-rqlite-9.4.8	11m 59s
distributed-tests-9.4.8	5m 28s
	1h 36m 42s

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