chore: migrate sdk-platform-java to monorepo #90

Job	Run time
filter	1m 12s
build (11)	13m 26s
build(8) except for gapic-generator-java	3m 51s
build(25) except self-service clients	12m 12s
dependency_analyzer_unit_test	1m 15s
build(8) for gapic-generator-java	11m 7s
build (17)	13m 31s
build(8) for showcase	9m 1s
showcase (17)	10m 10s
showcase (21)	9m 53s
unmanaged_dependency_check	7m 17s
showcase-clirr	1m 44s
build(21) except self-service clients	12m 8s
showcase (11)	10m 7s
gapic-generator-java-bom	2m 3s
showcase (25)	10m 0s
	2h 8m 57s

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