Revert "build: switch example e2e tests to bazel (#28402)" (#28438)

This reverts commit ef78e33560.

PR Close #28438

packages/examples/core/main.ts

@@ -1,12 +0,0 @@
-/**
- * @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 {platformBrowserDynamic} from '@angular/platform-browser-dynamic';
-import {TestsAppModuleNgFactory} from './test_module.ngfactory';
-
-platformBrowserDynamic().bootstrapModuleFactory(TestsAppModuleNgFactory);