docs: enable E2E test for setup example (#28592)

This guide is not being shown publicly, and its test is currently being ignored.
Instead of deleting this test and guide, it may be repurposed in the future for a local development guide.

PR Close #28592

aio/content/examples/setup/e2e/src/app.e2e-spec.ts

@@ -0,0 +1,17 @@
+'use strict'; // necessary for es6 output in node
+
+import { browser, element, by } from 'protractor';
+
+describe('QuickStart E2E Tests', function () {
+
+  let expectedMsg = 'Hello Angular';
+
+  beforeEach(function () {
+    browser.get('');
+  });
+
+  it(`should display: ${expectedMsg}`, function () {
+    expect(element(by.css('h1')).getText()).toEqual(expectedMsg);
+  });
+
+});