remove deprecation-warning container as its unused

app/views/shared/milestones/_top.html.haml

@@ -30,7 +30,7 @@
         - else
           = link_to 'Reopen Milestone', group_milestone_route(milestone, {state_event: :activate }), method: :put, class: "btn btn-grouped btn-reopen"
 
-.deprecation-warning.prepend-top-default
+.prepend-top-default
   = image_tag 'illustrations/milestone_removing-page.svg', class: 'append-right-default'
   .inline.vertical-align-middle
     %strong This page will be removed in a future release.