fix(ai): Resolve unstructured throwing task warnings on XC 27

[andrewheard]

Resolved the warnings "Unstructured throwing task created by 'init(name:priority:operation:)' is not used, which may accidentally ignore errors thrown inside the task" that are emitted in Xcode 27. This is an alternative to #16298 where the AI decided it was better to throw the errors instead of calling continuation.finish(throwing: error).

#no-changelog

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