build: Remove vertex-ai from releasing. #17377

Job	Run time
owlbot-py	1m 9s
gapic-bom	1m 40s
group_id_check_for_maps_libraries	8m 17s
root-pom	1m 44s
package_name_check	1m 0s
gitignore_correctness	1m 9s
generate-readme	1m 12s
owlbot-yaml	1m 6s
	17m 17s

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