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chore(vertexai): fork vertexai sdk away from generative ai sdk. #5461

Job	Run time
web (tests)	5m 6s
android (tests)	6m 37s
android (packages/cloud_firestore/cloud_firestore/example)	45m 1s
web (packages/cloud_firestore/cloud_firestore/example)	4m 57s
macos (tests)	8m 35s
ios (tests)	36m 20s
web-wasm (tests)	3m 3s
macos (packages/cloud_firestore/cloud_firestore/example)	5m 31s
windows	7m 55s
ios (packages/cloud_firestore/cloud_firestore/example)	11m 5s
web-wasm (packages/cloud_firestore/cloud_firestore/example)	5m 55s
windows-firestore	6m 32s
	2h 26m 37s

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