Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/47565
Changelog: [internal]
We unified the feature flags for the event loop in https://github.com/facebook/react-native/pull/47084, but we left the legacy flags defined for temporary backwards compatibility.
We don't need that anymore, so we can clean them up.
Reviewed By: fabriziocucci
Differential Revision: D65606068
fbshipit-source-id: 403c278cef2afc8eddf07592d88cadc58765f660