Merge branch '212371-create-system-notes-when-changing-issues-health-status' into 'master'

Added icon for health status

See merge request gitlab-org/gitlab!28381

app/helpers/system_note_helper.rb

@@ -26,7 +26,8 @@ module SystemNoteHelper
     'duplicate' => 'duplicate',
     'locked' => 'lock',
     'unlocked' => 'lock-open',
-    'due_date' => 'calendar'
+    'due_date' => 'calendar',
+    'health_status' => 'status-health'
   }.freeze
 
   def system_note_icon_name(note)