chore: migrate sdk-platform-java to monorepo #67

Job	Run time
filter	1m 24s
downstream-compatibility-spring-generator	10m 59s
downstream-compatibility (java-firestore)	3m 29s
downstream-compatibility (java-spanner-jdbc)	3m 20s
downstream-compatibility (java-pubsublite)	3m 16s
downstream-compatibility (java-spanner)	7m 6s
downstream-compatibility (java-bigtable)	7m 25s
downstream-compatibility (java-bigquery)	3m 37s
downstream-compatibility (java-storage)	5m 35s
downstream-compatibility (java-storage-nio)	3m 24s
downstream-compatibility (java-pubsub)	2m 44s
	52m 19s

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