PERF: remove uneeded data, notification count is pointless

Getting notification count is expensive, no point shipping it to clients

app/assets/javascripts/discourse/templates/user/user.hbs

@@ -170,7 +170,6 @@
             {{#link-to 'user.notifications'}}
               {{fa-icon "comment" class="glyph"}}
               {{i18n 'user.notifications'}}
-              <span class='count'>({{model.notification_count}})</span>
             {{/link-to}}
           {{/link-to}}
         {{/if}}

app/serializers/user_serializer.rb

@@ -60,7 +60,6 @@ class UserSerializer < BasicUserSerializer
              :suspended_till,
              :uploaded_avatar_id,
              :badge_count,
-             :notification_count,
              :has_title_badges,
              :edit_history_public,
              :custom_fields,
@@ -93,7 +92,6 @@ class UserSerializer < BasicUserSerializer
                      :tracked_category_ids,
                      :watched_category_ids,
                      :private_messages_stats,
-                     :notification_count,
                      :disable_jump_reply,
                      :gravatar_avatar_upload_id,
                      :custom_avatar_upload_id,
@@ -292,10 +290,6 @@ class UserSerializer < BasicUserSerializer
     object.badges.where(allow_title: true).count > 0
   end
 
-  def notification_count
-    Notification.where(user_id: object.id).count
-  end
-
   def include_edit_history_public?
     can_edit && !SiteSetting.edit_history_visible_to_public
   end