DEV: upgrades from Ember 2.13 to Ember 3.5.1 (#6808)

Co-Authored-By: Bianca Nenciu <nbianca@users.noreply.github.com>
Co-Authored-By: David Taylor <david@taylorhq.com>

test/javascripts/components/topic-notifications-options-test.js.es6

@@ -8,7 +8,7 @@ const buildTopic = function(archetype) {
     details: {
       notification_level: 1
     },
-    archetype: archetype
+    archetype
   });
 };
 
@@ -70,6 +70,7 @@ componentTest("PM topic notification level descriptions", {
       descriptions.length,
       "it has the correct copy"
     );
+
     uiTexts.forEach((text, index) => {
       assert.equal(
         text.trim(),