tests: Update showcase test to include service name in resource extraction #646

Job	Run time
filter	1m 0s
build(25) except self-service clients	11m 59s
build (17)	13m 38s
build(8) for showcase	9m 59s
build(21) except self-service clients	11m 50s
build(8) for gapic-generator-java	11m 18s
build (11)	14m 24s
showcase (21)	10m 18s
dependency_analyzer_unit_test	1m 17s
gapic-generator-java-bom	2m 13s
showcase-clirr	5m 12s
showcase (11)	10m 53s
build(8) except for gapic-generator-java	3m 57s
showcase (25)	10m 12s
unmanaged_dependency_check	8m 19s
showcase (17)	10m 29s
	2h 16m 58s

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