ci: Skip checkstyle plugin when running dependencies CI #16392

Job	Run time
owlbot-py	1m 5s
owlbot-yaml	55s
gitignore_correctness	57s
gapic-bom	1m 37s
group_id_check_for_maps_libraries	6m 45s
root-pom	1m 37s
package_name_check	1m 2s
generate-readme	1m 9s
	15m 7s

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