chore: add markers in pom.xml #19551

Job	Run time
gitignore_correctness	1m 25s
root-pom	1m 57s
gapic-bom	2m 0s
generate-readme	1m 31s
group_id_check_for_maps_libraries	9m 13s
owlbot-py	1m 23s
owlbot-yaml	1m 25s
package_name_check	1m 8s
	20m 2s

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