build: use local google-auth-library in bazel tests #1231

Job	Run time
filter	1m 6s
build(8) for showcase	10m 9s
build(25) except self-service clients	14m 0s
build(8) except for gapic-generator-java	3m 49s
build (17)	11m 39s
build(21) except self-service clients	14m 2s
build(8) for gapic-generator-java	11m 12s
showcase-clirr	5m 17s
dependency_analyzer_unit_test	1m 18s
build (11)	11m 54s
unmanaged_dependency_check	9m 22s
showcase (11)	13m 55s
gapic-generator-java-bom	3m 22s
showcase (21)	13m 41s
showcase (25)	13m 39s
showcase (17)	13m 45s
	2h 32m 10s

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