chore: migrate sdk-platform-java to monorepo #76

Job	Run time
filter	1m 13s
dependency_analyzer_unit_test	1m 22s
build(8) except for gapic-generator-java	4m 17s
build(8) for showcase	9m 34s
build (11)	13m 32s
build(21) except self-service clients	14m 28s
unmanaged_dependency_check	12m 0s
build(8) for gapic-generator-java	11m 24s
build (17)	14m 24s
showcase (11)	10m 6s
build(25) except self-service clients	12m 35s
gapic-generator-java-bom	2m 53s
showcase-clirr	4m 57s
showcase (17)	9m 51s
showcase (21)	9m 23s
showcase (25)	11m 23s
	2h 23m 22s

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