build: use local google-auth-library in bazel tests #1057

Job	Run time
filter	1m 19s
downstream-compatibility-spring-generator	11m 57s
downstream-compatibility (java-bigtable)	5m 7s
downstream-compatibility (java-firestore)	5m 29s
downstream-compatibility (java-pubsublite)	4m 25s
downstream-compatibility (java-pubsub)	4m 21s
	32m 38s

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