fix: prepare to generate grafeas #6649

Job	Run time
build(8) except for gapic-generator-java	4m 5s
build (11)	12m 57s
build(21) except self-service clients	11m 17s
build (17)	12m 14s
build(8) for gapic-generator-java	9m 32s
compatibility	1m 42s
gapic-generator-java-bom	1m 55s
lint	26s
showcase (11)	4m 0s
showcase (17)	4m 1s
showcase-clirr	3m 23s
showcase-native	7m 58s
unmanaged_dependency_check	4m 23s
dependency_analyzer_unit_test	10s
	1h 18m 3s

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