chore: migrate java tests #3939

Job	Run time
downstream-compatibility-spring-generator	9m 39s
downstream-compatibility (google-cloud-java)	12m 27s
downstream-compatibility (java-bigtable)	5m 6s
downstream-compatibility (java-bigquery)	4m 22s
downstream-compatibility (java-bigquerystorage)	9m 18s
downstream-compatibility (java-datastore)	3m 22s
downstream-compatibility (java-firestore)	1m 59s
downstream-compatibility (java-logging)	1m 46s
downstream-compatibility (java-logging-logback)	1m 41s
downstream-compatibility (java-pubsub)	2m 29s
downstream-compatibility (java-pubsublite)	2m 38s
downstream-compatibility (java-spanner-jdbc)	2m 57s
downstream-compatibility (java-spanner)	6m 38s
downstream-compatibility (java-storage)	4m 0s
downstream-compatibility (java-storage-nio)	2m 40s
	1h 11m 2s

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