feat(ai): Add support for `AbortSignal` #23140

Job	Run time
Build the SDK	9m 12s
(Auth) Node.js and Browser (Chrome) Tests	2m 54s
(Firestore) Node.js and Browser (Chrome) Tests	26m 5s
Firestore Integration Tests (memory)	5m 27s
(bulk) Node.js and Browser (Chrome) Tests	3m 55s
Firestore Integration Tests (persistence)	6m 42s
	54m 15s

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