tests: Update showcase test to include service name in resource extra… #676

Job	Run time
filter	1m 4s
build(8) except for gapic-generator-java	4m 8s
build(21) except self-service clients	12m 14s
build(8) for showcase	9m 47s
build (17)	13m 12s
build (11)	14m 28s
build(8) for gapic-generator-java	10m 56s
build(25) except self-service clients	12m 14s
gapic-generator-java-bom	2m 13s
showcase (11)	10m 56s
unmanaged_dependency_check	9m 50s
dependency_analyzer_unit_test	45s
showcase (25)	10m 11s
showcase (17)	10m 36s
showcase (21)	10m 36s
showcase-clirr	0s
	2h 13m 10s

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