tests: Update showcase test to include service name in resource extraction #17295

Job	Run time
gitignore_correctness	1m 2s
gapic-bom	1m 41s
group_id_check_for_maps_libraries	7m 58s
owlbot-py	1m 6s
owlbot-yaml	1m 2s
generate-readme	1m 5s
package_name_check	1m 2s
root-pom	1m 39s
	16m 35s

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