Actively reject UiKitView gestures. (#25792)
flutter/engine#7307 changes the engine side of embedded UIView to only reject gestures when the framework sends a `rejectGesture` message, so that gesture resolution can done after a touch sequence has ended (see PR description for flutter/engine#7307 for more details). This change makes the framework send a `rejectGesture` message to the engine when a UiKitView rejects a gesture. I'm planning to land this PR before the engine side change, so right now it swallows the exception thrown if there is no engine implementation for `rejectGesture` (which keeps us with the current behavior). After this change lands I'll land the engine PR, and then clean up the part that swallows the exception.
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