chore: migrate sdk-platform-java to monorepo #68

Job	Run time
filter	1m 15s
build(8) for gapic-generator-java	10m 19s
build(25) except self-service clients	12m 29s
build(21) except self-service clients	12m 45s
build(8) except for gapic-generator-java	3m 53s
build(8) for showcase	9m 3s
unmanaged_dependency_check	7m 50s
showcase-clirr	1m 37s
gapic-generator-java-bom	2m 45s
build (17)	12m 59s
dependency_analyzer_unit_test	1m 12s
showcase (17)	2m 55s
showcase (11)	2m 44s
showcase (21)	2m 55s
build (11)	13m 21s
showcase (25)	2m 39s
	1h 40m 41s

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