chore: migrate sdk-platform-java to monorepo #77

Job	Run time
filter	1m 14s
build(25) except self-service clients	13m 4s
build(8) except for gapic-generator-java	3m 53s
build(21) except self-service clients	12m 3s
showcase-clirr	1m 48s
build(8) for showcase	9m 7s
build (11)	13m 36s
unmanaged_dependency_check	8m 25s
build (17)	13m 52s
build(8) for gapic-generator-java	12m 58s
showcase (11)	9m 53s
showcase (17)	10m 40s
gapic-generator-java-bom	2m 14s
showcase (21)	10m 2s
dependency_analyzer_unit_test	1m 16s
showcase (25)	9m 38s
	2h 13m 43s

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