build: Remove vertex-ai from releasing. #17230

Job	Run time
owlbot-yaml	1m 3s
group_id_check_for_maps_libraries	7m 56s
root-pom	1m 45s
gapic-bom	1m 44s
generate-readme	1m 6s
gitignore_correctness	1m 4s
owlbot-py	1m 11s
package_name_check	1m 6s
	16m 55s

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