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

This reverts commit 8310c91823.

modules/@angular/platform-browser-dynamic/rollup-testing.config.js

@@ -1,15 +1,6 @@
-/**
- * @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-browser-dynamic/testing/index.js',
-  dest:
-      '../../../dist/packages-dist/platform-browser-dynamic/bundles/platform-browser-dynamic-testing.umd.js',
+  dest: '../../../dist/packages-dist/platform-browser-dynamic/bundles/platform-browser-dynamic-testing.umd.js',
   format: 'umd',
   moduleName: 'ng.platformBrowserDynamic.testing',
   globals: {
@@ -22,4 +13,4 @@ export default {
     '@angular/platform-browser/testing': 'ng.platformBrowser.testing',
     '@angular/platform-browser-dynamic': 'ng.platformBrowserDynamic'
   }
-};
+}