services/progress: Remove progress bar when running tests

Waiting for the progressbar to finish animating was slowing down the tests unnecessarily, so instead of waiting for it to finish animating we won't show it anymore at all.

app/services/progress.js

@@ -1,14 +1,12 @@
 import Service, { inject as service } from '@ember/service';
 import { htmlSafe } from '@ember/string';
 import { tracked } from '@glimmer/tracking';
+import Ember from 'ember';
 
 import { rawTimeout, task } from 'ember-concurrency';
-import { buildWaiter } from 'ember-test-waiters';
 
 const SPEED = 200;
 
-let waiter = buildWaiter('progress-bar');
-
 export default class ProgressService extends Service {
   @service router;
 
@@ -29,7 +27,7 @@ export default class ProgressService extends Service {
   counterTask;
 
   @(task(function* () {
-    let token = waiter.beginAsync();
+    if (Ember.testing) return;
 
     let progress = 0;
     this._style = `width: 0%`;
@@ -61,8 +59,6 @@ export default class ProgressService extends Service {
     this._style = `transition: width ${SPEED}ms linear; width: 100%`;
     yield rawTimeout(SPEED);
     this._style = `transition: opacity ${SPEED * 2}ms linear; width: 100%; opacity: 0`;
-
-    waiter.endAsync(token);
   }).drop())
   updateTask;
 }