[RN] Migrate from ReactNativeInternalFeatureFlags to a module in the react-native package #30978
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Summary
The Meta builds for the React Native renderer reference a
ReactNativeInternalFeatureFlags
module that's expected to be defined in Haste when building the renderer together with RN at Meta. We're migrating away from this module and we've moved these definitions to the RN repository, so both definitions are OSS and we have more flexibility to define those flags at Meta (concretely, so we can use feature flags defined inreact-native/src/private/featureflags/ReactNativeFeatureFlags
without having circular dependencies).How did you test this change?
Existing unit tests in React.
Will manually sync these changes to react-native to test the approach e2e.