ci: bring the dependencies check back #1485

Job	Run time
filter	1m 8s
downstream-compatibility (spring-cloud-gcp)	11m 35s
downstream-compatibility (java-pubsub)	4m 17s
downstream-compatibility (java-pubsublite)	4m 13s
downstream-compatibility (java-firestore)	3m 49s
downstream-compatibility (java-bigtable)	9m 10s
conditional-required-check	3s
	34m 15s

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