feat: add v1 to merchantapi libraries #14703

Job	Run time
generate-readme	50s
gitignore_correctness	40s
group_id_check_for_maps_libraries	6m 24s
gapic-bom	1m 18s
owlbot-py	1m 25s
root-pom	1m 18s
owlbot-yaml	56s
package_name_check	41s
	13m 32s

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