chore(lint): Added license headers to most TypeScript files

Relates to #9380

modules/@angular/platform-server/testing/server.ts

@@ -1,3 +1,11 @@
+/**
+ * @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
+ */
+
 import {MockLocationStrategy} from '@angular/common/testing';
 import {COMPILER_PROVIDERS, DirectiveResolver, ViewResolver, XHR} from '@angular/compiler';
 import {MockDirectiveResolver, MockViewResolver, TestComponentBuilder, TestComponentRenderer} from '@angular/compiler/testing';