message: ref(ember): Fix Qunit causing flake
  A recent update to QUnit (2.17) changed onUnhandledRejection to onUncaughtException. Ember try seems to be re-installing the latest qunit. This fix should make both sides of the QUnit change work.
diff: @@ -28,9 +28,13 @@ export function setupSentryTest(hooks) {
  this.fetchStub = sinon.stub(window, 'fetch');
  /**
  - * Stops global test suite failures from unhandled rejections and allows assertion on them
  + * Stops global test suite failures from unhandled rejections and allows assertion on them.
  + * onUncaughtException is used in QUnit 2.17 onwards.
  */
  - this.qunitOnUnhandledRejection = sinon.stub(QUnit, 'onUnhandledRejection');
  + this.qunitOnUnhandledRejection = sinon.stub(
  + QUnit,
  + QUnit.onUncaughtException ? 'onUncaughtException' : 'onUnhandledRejection',
  + );
  QUnit.onError = function({ message }) {
  errorMessages.push(message.split('Error: ')[1]);
  