chore: remove library generation IT on workflow #9690

Job	Run time
build (11)	14m 43s
build (11)	14m 43s
build (17)	14m 25s
build (17)	14m 25s
build(21) except self-service clients	13m 29s
build(21) except self-service clients	13m 29s
build(8) except for gapic-generator-java	4m 33s
build(8) except for gapic-generator-java	4m 33s
build(8) for gapic-generator-java	11m 1s
build(8) for gapic-generator-java	11m 1s
compatibility	1m 33s
compatibility	1m 33s
dependency_analyzer_unit_test	18s
dependency_analyzer_unit_test	18s
gapic-generator-java-bom	1m 44s
gapic-generator-java-bom	1m 44s
lint	22s
lint	22s
showcase (11)	4m 16s
showcase (11)	4m 36s
showcase-native	8m 24s
showcase-native	8m 24s
showcase (17)	4m 29s
showcase (17)	4m 25s
showcase-clirr	3m 2s
showcase-clirr	3m 2s
showcase (21)	4m 14s
showcase (21)	4m 14s
unmanaged_dependency_check	4m 13s
unmanaged_dependency_check	4m 13s
	3h 1m 48s

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