ui: replace qunit start tests with ember-exam start

ui/tests/test-helper.js

@@ -2,7 +2,7 @@ import 'core-js';
 import Application from 'nomad-ui/app';
 import config from 'nomad-ui/config/environment';
 import { setApplication } from '@ember/test-helpers';
-import { start } from 'ember-qunit';
+import start from 'ember-exam/test-support/start';
 import { useNativeEvents } from 'ember-cli-page-object/extend';
 
 useNativeEvents();

ui/yarn.lock

@@ -9313,7 +9313,7 @@ ember-element-helper@^0.3.2:
     ember-cli-htmlbars "^5.1.0"
     ember-compatibility-helpers "^1.2.1"
-ember-exam@^6.1.0:
+ember-exam@6.1.0:
   version "6.1.0"
   resolved "https://registry.yarnpkg.com/ember-exam/-/ember-exam-6.1.0.tgz#1ea2c0ece27ac8ad6a80d959b1c207611b7dfdd7"
   integrity sha512-H9tg7eUgqkjAsr1/15UzxGyZobGLgsyTi56Ng0ySnkYGCRfvVpwtVc3xgcNOFnUaa9RExUFpxC0adjW3K87Uxw==