Making RN Codegen generate ComponentDescriptors.cpp (#49939)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/49939

Making RNCodegen.js generate the ComponentDesciptors.cpp and https://github.com/facebook/react-native/pull/42962 adds all entries, just missed this one.

Changelog:
[Android] [Fixed] - Fix RNCodegen.js for generating ComponentDescriptors.cpp

Reviewed By: shwanton

Differential Revision: D70925850

fbshipit-source-id: 2e2eae64f5371b0bc5a452d4bd0c9269e9253bb1

packages/react-native-codegen/src/generators/RNCodegen.js

@@ -114,7 +114,10 @@ type SchemasConfig = $ReadOnly<{
 }>;
 
 const LIBRARY_GENERATORS = {
-  descriptors: [generateComponentDescriptorH.generate],
+  descriptors: [
+    generateComponentDescriptorCpp.generate,
+    generateComponentDescriptorH.generate,
+  ],
   events: [generateEventEmitterCpp.generate, generateEventEmitterH.generate],
   states: [generateStateCpp.generate, generateStateH.generate],
   props: [