chore: partial release script #15539

Job	Run time
root-pom	1m 26s
gapic-bom	1m 29s
owlbot-yaml	51s
owlbot-py	56s
gitignore_correctness	50s
package_name_check	47s
generate-readme	51s
group_id_check_for_maps_libraries	1m 12s
	8m 22s

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