Revert "refactor: add license header to JS files & format files (#12035)"

This reverts commit 8310c91823.

modules/@angular/platform-server/rollup-testing.config.js

@@ -1,10 +1,3 @@
-/**
- * @license
- * Copyright Google Inc. All Rights Reserved.
- *
- * Use of this source code is governed by an MIT-style license that can be
- * found in the LICENSE file at https://angular.io/license
- */
 
 export default {
   entry: '../../../dist/packages-dist/platform-server/testing/index.js',
@@ -20,4 +13,4 @@ export default {
     '@angular/platform-server': 'ng.platformServer',
     '@angular/platform-browser-dynamic/testing': 'ng.platformBrowserDynamic.testing'
   }
-};
+}