chore: demo of showcase with json_name #18547

Job	Run time
root-pom	1m 51s
generate-readme	1m 24s
package_name_check	1m 5s
gitignore_correctness	56s
gapic-bom	1m 37s
group_id_check_for_maps_libraries	2m 38s
owlbot-py	1m 11s
owlbot-yaml	1m 12s
	11m 54s

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