chore: add comment markers to pom.xml files #19879

Job	Run time
gapic-bom	1m 54s
owlbot-yaml	32s
root-pom	1m 53s
gitignore_correctness	1m 10s
owlbot-py	1m 22s
generate-readme	36s
package_name_check	1m 12s
group_id_check_for_maps_libraries	8m 33s
	17m 12s

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