Enhancement: Paginate conversation calls in tabs (#560)

* Use conversationPage module for pagination

* Load more conversations

* Reset list if conversation status is changed

* Add specs to conversationPage

* Reset filter when page is re-mounted

* Update text

* Update text

app/javascript/dashboard/constants.js

@@ -4,9 +4,13 @@ export default {
     return `${this.APP_BASE_URL}/`;
   },
   GRAVATAR_URL: 'https://www.gravatar.com/avatar/',
-  ASSIGNEE_TYPE_SLUG: {
-    MINE: 0,
-    UNASSIGNED: 1,
-    OPEN: 0,
+  ASSIGNEE_TYPE: {
+    ME: 'me',
+    UNASSIGNED: 'unassigned',
+    ALL: 'all',
+  },
+  STATUS_TYPE: {
+    OPEN: 'open',
+    RESOLVED: 'resolved',
   },
 };