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Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/41658 changelog: [internal] FabricEventDispatcher does not need to run on every frame. Whenever a new event is added to Fabric's event queue, it will call `FabricUIManager.onRequestEventBeat` in Java. This in turn calls `FabricEventDispatcher.maybePostFrameCallbackFromNonUI` and adds a frame callback on the Choreographer. This makes code simpler, as we do not need to manage the frame callback subscription. Reviewed By: sammy-SC Differential Revision: D50604303 fbshipit-source-id: ce2c7b77678bfc14aa7ecac71e40f78263c7036a