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

Relates to #9380

modules/@angular/core/test/reflection/reflector_common.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 {makeDecorator, makeParamDecorator, makePropDecorator} from '@angular/core/src/util/decorators';
 
 export class ClassDecoratorMeta {

modules/@angular/core/test/reflection/reflector_spec.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 {describe, it, iit, ddescribe, expect, beforeEach,} from '@angular/core/testing/testing_internal';
 import {OnInit} from '@angular/core';
 import {Reflector, ReflectionInfo} from '@angular/core/src/reflection/reflection';