Summary:
Without moving this, we would get this warning about a require cycle on the next diff, because DummyUIManager and LazyUIManager both need unstable_hasComponent.
```
(NOBRIDGE) WARN Require cycle: react-native-github/Libraries/NativeComponent/NativeComponentRegistry.js -> react-native-github/Libraries/ReactNative/UIManager.js -> react-native-github/Libraries/ReactNative/DummyUIManager.js -> react-native-github/Libraries/NativeComponent/NativeComponentRegistry.js
Require cycles are allowed, but can result in uninitialized values. Consider refactoring to remove the need for a cycle.
```
Changelog: [Internal]
Reviewed By: philIip, RSNara
Differential Revision: D33511566
fbshipit-source-id: fd8c9732408d08ab17335273f86168bf30747929
Paige Sun