chore: migrate sdk-platform-java to monorepo #87

Job	Run time
filter	1m 14s
build(8) for gapic-generator-java	2m 41s
build(25) except self-service clients	4m 46s
build(8) except for gapic-generator-java	4m 17s
build(8) for showcase	9m 32s
build (11)	5m 21s
build (17)	5m 7s
unmanaged_dependency_check	10m 49s
gapic-generator-java-bom	2m 53s
build(21) except self-service clients	4m 50s
showcase-clirr	1m 41s
dependency_analyzer_unit_test	1m 24s
showcase (17)	10m 3s
showcase (21)	9m 32s
showcase (11)	9m 27s
showcase (25)	9m 47s
	1h 33m 24s

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