Merge branch 'flash-messages-scb' into 'master'

Resolve CE/EE diffs in _flash_messages

Closes gitlab-ee#11037

See merge request gitlab-org/gitlab-ce!28333

app/views/projects/_flash_messages.html.haml

@@ -7,3 +7,4 @@
     = render 'shared/no_password'
     - unless project.empty_repo?
       = render 'shared/auto_devops_implicitly_enabled_banner', project: project
+    = render_if_exists 'projects/above_size_limit_warning', project: project