[Vertex AI] Add a responseMimeType to generationConfig #12213

Job	Run time
Build Firestore	8m 50s
Build Firestore	8m 50s
Test Firestore (test:browser)	6m 56s
Test Firestore (test:browser)	6m 56s
Test Firestore (test:travis)	3m 48s
Test Firestore (test:travis)	3m 48s
Test Firestore Compatible on Firefox	6m 27s
Test Firestore Compatible on Firefox	6m 27s
Test Firestore (test:lite:browser)	1m 35s
Test Firestore (test:lite:browser)	1m 35s
Test Nightly Firestore with Chrome	0s
Test Nightly Firestore with Chrome	0s
Test Firestore Compatible	5m 6s
Test Firestore Compatible	5m 6s
Test Firestore (test:browser:prod:nameddb)	6m 44s
Test Firestore (test:browser:prod:nameddb)	6m 44s
Test Firestore (test:lite:browser:nameddb)	1m 51s
Test Firestore (test:lite:browser:nameddb)	1m 51s
Test Firestore on Firefox (test:browser)	7m 58s
Test Firestore on Firefox (test:browser)	7m 12s
Test Firestore on Firefox (test:travis)	3m 46s
Test Firestore on Firefox (test:travis)	3m 46s
Test Firestore on Firefox (test:lite:browser)	1m 55s
Test Firestore on Firefox (test:lite:browser)	1m 55s
Test Firestore on Firefox (test:browser:prod:nameddb)	8m 15s
Test Firestore on Firefox (test:browser:prod:nameddb)	8m 12s
Test Firestore on Firefox (test:lite:browser:nameddb)	2m 4s
Test Firestore on Firefox (test:lite:browser:nameddb)	2m 4s
Check all required tests results	1s
Check all required tests results	1s
	2h 9m 43s

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