chore: 🤖 re-enable mirage for core dummy app

Author: hashicc

addons/core/tests/dummy/config/environment.js

@@ -41,6 +41,10 @@ module.exports = function (environment) {
       namespace: 'v1',
     },
 
+    ember: {
+      enabled: true,
+    },
+
     enableConfirmService: false,
   };