build: Remove vertex-ai from releasing. #17240

Job	Run time
gapic-bom	2m 0s
root-pom	1m 58s
owlbot-yaml	1m 18s
package_name_check	1m 18s
group_id_check_for_maps_libraries	8m 10s
gitignore_correctness	1m 3s
owlbot-py	1m 26s
generate-readme	1m 24s
	18m 37s

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