chore: migrate sdk-platform-java to monorepo #78

Job	Run time
filter	1m 22s
build(21) except self-service clients	12m 24s
build(8) for showcase	9m 10s
build (11)	14m 17s
build(25) except self-service clients	12m 8s
build(8) for gapic-generator-java	11m 4s
build(8) except for gapic-generator-java	3m 51s
unmanaged_dependency_check	10m 16s
dependency_analyzer_unit_test	2m 30s
build (17)	13m 41s
gapic-generator-java-bom	2m 13s
showcase-clirr	1m 38s
showcase (11)	13m 51s
showcase (17)	10m 39s
showcase (21)	9m 37s
showcase (25)	12m 29s
	2h 21m 10s

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