chore: Add script to automate PR merging (#11758) #15211

Job	Run time
gapic-bom	1m 25s
root-pom	1m 26s
owlbot-py	55s
gitignore_correctness	45s
generate-readme	54s
group_id_check_for_maps_libraries	6m 37s
package_name_check	46s
owlbot-yaml	44s
	13m 32s

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