Martin Kralik 31bb85a210 limit fake scroll event emitting
Summary:A need for sending a scroll events outside of scrollview made D3092854 a bit clunky. This diff kinda fixes it by tightening up emitting of fake scroll events just to the only usecase we have right now.

Why not just simply construct the event in `RCTNavigator`, so we can drop the code from `RCTScrollView` altogether?
`RCTScrollEvent` is private to `RCTScrollView`, and that's good. We don't want anyone have an ability to make up scroll events. Even this existing functionality should be sunset one day when we better integrate with native gesture recognizers.

Depends on D3092867.

Reviewed By: javache

Differential Revision: D3120751

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fbshipit-source-id: 6519c055b983cfd48c4b4a9d619c4452e12efda1
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