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

* No longer builds the example e2e tests using "tsc". The examples are now built with Bazel and can therefore be built with Ivy by using the `--define=compile=aot` switch.
* No longer runs the example e2e tests using the protractor CLI. example e2e tests are executed with the Bazel protractor rule and can therefore run incrementally.

NOTE: Unit tests found within the examples are still running within the legacy jobs.

PR Close #28402

packages/examples/common/main.ts

@@ -0,0 +1,12 @@
+/**
+ * @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);