chore: migrate sdk-platform-java to monorepo #62

Job	Run time
filter	1m 10s
build(8) except for gapic-generator-java	3m 51s
build(25) except self-service clients	4m 21s
build(8) for gapic-generator-java	2m 47s
showcase-clirr	1m 40s
build (17)	4m 35s
dependency_analyzer_unit_test	1m 15s
build(8) for showcase	9m 12s
build (11)	4m 49s
unmanaged_dependency_check	6m 21s
gapic-generator-java-bom	2m 17s
showcase (11)	2m 43s
build(21) except self-service clients	4m 45s
showcase (21)	2m 31s
showcase (17)	2m 41s
showcase (25)	2m 31s
	57m 29s

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