Use CommonJS in feature flags definitions to simplify loading from No…

…de.js (#46887)

Summary:
Pull Request resolved: #46887

Changelog: [internal]

This is a small change to use CommonJS in `ReactNativeFeatureFlags.config.js` so the file can be easily imported from Node.js.

Reviewed By: jorge-cab

Differential Revision: D64039860

fbshipit-source-id: c84ddbdbfe942224e213d12b9496c41b73dd5731

packages/react-native/scripts/featureflags/ReactNativeFeatureFlags.config.js

@@ -605,4 +605,5 @@ const definitions: FeatureFlagDefinitions = {
   },
 };
 
-export default definitions;
+// Keep it as a CommonJS module so we can easily import it from Node.js
+module.exports = definitions;