chore: make library generation integration test required #9692

Job	Run time
build(21) except self-service clients	13m 16s
build (11)	14m 49s
build(8) except for gapic-generator-java	4m 15s
build (17)	14m 17s
build(8) for gapic-generator-java	11m 20s
compatibility	1m 34s
dependency_analyzer_unit_test	14s
gapic-generator-java-bom	2m 8s
lint	21s
showcase (11)	4m 18s
showcase (17)	4m 36s
showcase-clirr	3m 7s
showcase-native	8m 39s
showcase (21)	4m 28s
unmanaged_dependency_check	5m 21s
	1h 32m 43s

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