Codegen: ignore NativeUIManager.js when producing schema given a JavaScript directory

Summary:
When crawling a provided JS directory to find all .js files for NativeModules and native components, ignore `NativeUIManager.js` for now, because it will be replaced with the Fabric UIManager in the future. The existing NativeUIManagerSpec.java won't be produced by the codegen, but stays manually checked in just in case: https://github.com/facebook/react-native/blob/0199a0392c65fa72d9599262ba1b4f8e14c0fc04/ReactAndroid/src/main/java/com/facebook/fbreact/specs/NativeUIManagerSpec.java

Changelog: [Internal]

Reviewed By: mdvacca

Differential Revision: D23312859

fbshipit-source-id: 7d554fefa651732c13e478b8ec94566348ed3142

packages/react-native-codegen/src/cli/combine/combine-js-to-schema-cli.js

@@ -29,6 +29,9 @@ fileList.forEach(file => {
       .filter(
         f =>
           /^(Native.+|.+NativeComponent)/.test(path.basename(f)) &&
+          // NativeUIManager will be deprecated by Fabric UIManager.
+          // For now, ignore this spec completely because the types are not fully supported.
+          !f.endsWith('NativeUIManager.js') &&
           !f.includes('__tests'),
       );
     allFiles.push(...dirFiles);