fix: prepare to generate grafeas #6659

Job	Run time
build (11)	12m 25s
build(21) except self-service clients	11m 6s
build (17)	12m 6s
build(8) except for gapic-generator-java	3m 46s
build(8) for gapic-generator-java	9m 30s
compatibility	1m 31s
lint	20s
showcase (11)	3m 58s
showcase-native	8m 11s
showcase (17)	4m 5s
dependency_analyzer_unit_test	19s
gapic-generator-java-bom	1m 54s
showcase-clirr	2m 58s
unmanaged_dependency_check	5m 52s
	1h 18m 1s

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