chore: generate poms with grpc dependencies as test scoped #7802

Job	Run time
build(21) except self-service clients	13m 38s
build(8) except for gapic-generator-java	4m 10s
build (11)	14m 40s
build(8) for gapic-generator-java	11m 45s
build (17)	15m 10s
compatibility	1m 30s
lint	25s
showcase (11)	4m 7s
showcase-clirr	2m 55s
showcase (17)	4m 8s
dependency_analyzer_unit_test	13s
showcase-native	8m 1s
showcase (21)	3m 55s
gapic-generator-java-bom	1m 40s
unmanaged_dependency_check	3m 50s
	1h 30m 7s

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