no multiple registration

Author: patricklx

packages/@ember/debug/ember-inspector-support/index.ts

@@ -8,6 +8,9 @@ import Application from '@ember/application';
 import type ApplicationInstance from '@ember/application/instance';
 
 export function setupEmberInspectorSupport() {
+  if ((window as any).EMBER_INSPECTOR_SUPPORT_BUNDLED) {
+    return;
+  }
   (window as any).EMBER_INSPECTOR_SUPPORT_BUNDLED = true;
   window.addEventListener('ember-inspector-loaded' as any, (event: CustomEvent) => {
     const adapter = event.detail.adapter;