Make edition=octane in ember-cli-fastboot for Ember v4 compatibility

Author: SergeAstapov

packages/ember-cli-fastboot/config/ember-try.js

@@ -86,6 +86,9 @@ module.exports = async function () {
           }),
         },
         npm: {
+          devDependencies: {
+            'ember-source': '~3.28.0',
+          },
           ember: {
             edition: 'classic',
           },

packages/ember-cli-fastboot/package.json

@@ -107,7 +107,7 @@
     "registry": "https://registry.npmjs.org/"
   },
   "ember": {
-    "edition": "classic"
+    "edition": "octane"
   },
   "ember-addon": {
     "configPath": "tests/dummy/config",

packages/ember-cli-fastboot/tests/dummy/config/optional-features.json

@@ -1,5 +1,5 @@
 {
-  "application-template-wrapper": true,
+  "application-template-wrapper": false,
   "default-async-observers": true,
   "jquery-integration": false,
   "template-only-glimmer-components": true

packages/ember-cli-fastboot/tests/integration/instance-initializers/clear-double-boot-test.js

@@ -21,11 +21,13 @@ module('Instance-initializer: clear-double-boot', function(hooks) {
 
   test('It can handle bad markup', async function(assert) {
     this.set('BAD_HTML', `
-      <script type="x/boundary" id="fastboot-body-start"></script>
-      <div id="content-in-between">
-        <em><em>
+      <div class="wrapper">
+        <script type="x/boundary" id="fastboot-body-start"></script>
+        <div id="content-in-between">
+          <em><em>
+        </div>
+        <script type="x/boundary" id="fastboot-body-end"></script>
       </div>
-      <script type="x/boundary" id="fastboot-body-end"></script>
     `);
 
     // render the whole tree dynamically to more closely mimc bad markup cases