build: update monorepo-migration scripts #16628

Job	Run time
package_name_check	1m 6s
owlbot-yaml	1m 10s
generate-readme	1m 7s
group_id_check_for_maps_libraries	6m 53s
owlbot-py	1m 19s
gapic-bom	1m 51s
gitignore_correctness	1m 6s
root-pom	1m 26s
	15m 58s

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