WIP: Display a project's `delete_error` on the project homepage.

app/views/projects/_deletion_failed.html.haml

+- if @project.delete_error.present?
+  .project-deletion-failed-message.alert.alert-warning
+    This project was scheduled for deletion, but failed with the message:
+    = @project.delete_error
+
+    .alert-link-group
+      = link_to "Don't show again", profile_path(user: {hide_no_ssh_key: true}), method: :put, class: 'alert-link'
+      |
+      = link_to 'Remind later', '#', class: 'hide-no-ssh-message alert-link'

app/views/projects/show.html.haml

@@ -7,6 +7,7 @@
   = auto_discovery_link_tag(:atom, project_path(@project, rss_url_options), title: "#{@project.name} activity")
 
 = content_for flash_message_container do
+  = render 'deletion_failed'
   - if current_user && can?(current_user, :download_code, @project)
     = render 'shared/no_ssh'
     = render 'shared/no_password'