build: add monorepo issue migration script #16043

Job	Run time
root-pom	1m 34s
owlbot-yaml	54s
gitignore_correctness	49s
owlbot-py	57s
package_name_check	49s
gapic-bom	1m 28s
generate-readme	55s
group_id_check_for_maps_libraries	6m 30s
	13m 56s

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