Add project Dependency List sidebar entry

This is a CE port of
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/13968.

app/views/layouts/nav/sidebar/_project.html.haml

@@ -36,6 +36,8 @@
 
           = render_if_exists 'projects/sidebar/security_dashboard'
 
+          = render_if_exists 'projects/sidebar/dependencies'
+
           - if can?(current_user, :read_cycle_analytics, @project)
             = nav_link(path: 'cycle_analytics#show') do
               = link_to project_cycle_analytics_path(@project), title: _('Cycle Analytics'), class: 'shortcuts-project-cycle-analytics' do