chore: migrate sdk-platform-java to monorepo #82

Job	Run time
filter	1m 28s
build(25) except self-service clients	12m 42s
build(8) except for gapic-generator-java	4m 29s
build (17)	14m 10s
build (11)	14m 12s
unmanaged_dependency_check	9m 10s
build(8) for showcase	9m 9s
showcase (17)	9m 59s
showcase (11)	10m 25s
dependency_analyzer_unit_test	1m 16s
build(21) except self-service clients	12m 12s
build(8) for gapic-generator-java	10m 52s
gapic-generator-java-bom	2m 43s
showcase (21)	12m 37s
showcase-clirr	2m 35s
showcase (25)	11m 13s
	2h 19m 12s

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