Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/45626
I'm deleting CoreFeatures class and all its imports because it was fully replaced by ReactNativeFeatureFlags
Changelog: [Internal][Removed] Delete CoreFeatures class in favor of ReactNativeFeatureFlags
Reviewed By: rubennorte
Differential Revision: D60137380
fbshipit-source-id: 8bf918cdd1ce66e315aa95e1c5a28879445ff9f9