DEV: Avoid hard-coding notification types integer in client side code.

Co-authored-by: Bianca Nenciu <nenciu.bianca@gmail.com>

test/javascripts/fixtures/notification_fixtures.js.es6

@@ -1,12 +1,15 @@
 /*jshint maxlen:10000000 */
-import { LIKED_CONSOLIDATED_TYPE } from "discourse/widgets/notification-item";
+import {
+  LIKED_CONSOLIDATED_TYPE,
+  REPLIED_TYPE
+} from "discourse/widgets/concerns/notification-types";
 
 export default {
   "/notifications": {
     notifications: [
       {
         id: 123,
-        notification_type: 2,
+        notification_type: REPLIED_TYPE,
         read: false,
         post_number: 2,
         topic_id: 1234,

test/javascripts/fixtures/site-fixtures.js.es6

@@ -1,4 +1,4 @@
-import { LIKED_CONSOLIDATED_TYPE } from "discourse/widgets/notification-item";
+import { LIKED_CONSOLIDATED_TYPE } from "discourse/widgets/concerns/notification-types";
 
 export default {
   "site.json": {