fix(@schematics/angular): use enableIvy as true

Blocked on angular/angular#28616

Author: filipesilva

packages/schematics/angular/application/files/root/tsconfig.app.json.template

@@ -9,6 +9,6 @@
     "**/*.spec.ts"
   ]<% if (experimentalIvy) { %>,
   "angularCompilerOptions": {
-    "enableIvy": "ngtsc"
+    "enableIvy": true
   }<% } %>
 }

tests/legacy-cli/e2e/tests/experimental/ivy.ts

@@ -5,11 +5,17 @@
  * 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 { getGlobalVariable } from '../../utils/env';
 import { request } from '../../utils/http';
 import { killAllProcesses } from '../../utils/process';
 import { createProject, ngServe } from '../../utils/project';
 
 export default async function() {
+  const argv = getGlobalVariable('argv');
+  if (!argv['ng-snapshots']) {
+    // Only run this test on 8.x versions of Angular, which are currently only on snapshots.
+    return;
+  }
   try {
     await createProject('ivy-project', '--experimental-ivy');