Extract EE specific files/lines for some project CI views

We have the following files containing EE specific code. We should move them to ee/

• app/views/projects/blob/viewers/_gitlab_ci_yml.html.haml
• app/views/projects/deploy_keys/_index.html.haml
• app/views/projects/environments/folder.html.haml
• app/views/projects/jobs/show.html.haml

If we use render_if_exists from https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/5767 it would be quite simple to do.