chore: migrate sdk-platform-java to monorepo #66

Job	Run time
filter	1m 26s
build(8) except for gapic-generator-java	4m 10s
build(8) for gapic-generator-java	10m 24s
build(8) for showcase	9m 2s
build (17)	12m 39s
build(25) except self-service clients	11m 59s
build(21) except self-service clients	12m 19s
gapic-generator-java-bom	2m 59s
showcase-clirr	1m 50s
build (11)	12m 22s
showcase (11)	2m 43s
showcase (25)	2m 33s
unmanaged_dependency_check	7m 49s
showcase (21)	2m 34s
showcase (17)	2m 31s
dependency_analyzer_unit_test	1m 10s
	1h 38m 30s

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