build: introduce testing infra for GraalVM "C" (#3739) #6327

Job	Run time
downstream-compatibility-spring-generator	9m 5s
downstream-compatibility (google-cloud-java)	12m 23s
downstream-compatibility (java-bigtable)	4m 15s
downstream-compatibility (java-datastore)	2m 42s
downstream-compatibility (java-logging)	1m 59s
downstream-compatibility (java-storage-nio)	2m 33s
downstream-compatibility (java-bigquerystorage)	9m 46s
downstream-compatibility (java-bigquery)	4m 33s
downstream-compatibility (java-logging-logback)	1m 39s
downstream-compatibility (java-spanner-jdbc)	2m 30s
downstream-compatibility (java-pubsub)	2m 7s
downstream-compatibility (java-pubsublite)	2m 15s
downstream-compatibility (java-spanner)	4m 21s
downstream-compatibility (java-firestore)	2m 8s
downstream-compatibility (java-storage)	3m 48s
	1h 6m 4s

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