Chore upgrate ember qunit (#1376)

* Upgrade ember-qunit and ember-exam

ui/desktop/package.json

@@ -86,7 +86,7 @@
     "ember-cli-template-lint": "^2.0.2",
     "ember-cli-terser": "^4.0.2",
     "ember-electron": "^3.1.1",
-    "ember-exam": "^6.1.0",
+    "ember-exam": "^8.0.0",
     "ember-export-application-global": "^2.0.1",
     "ember-inline-svg": "^1.0.1",
     "ember-load-initializers": "^2.1.2",
@@ -94,7 +94,7 @@
     "ember-modifier": "^3.2.7",
     "ember-page-title": "^7.0.0",
     "ember-pollster": "^0.0.1-beta.2",
-    "ember-qunit": "^5.1.4",
+    "ember-qunit": "^6.0.0",
     "ember-resolver": "^8.0.3",
     "ember-source": "~3.28.4",
     "ember-template-lint": "^4.14.0",