Merge branch '20046-snippets-menu' into 'master'

Change nav link snippet controller

Removes active Snippets nav link state for project-specific snippets

Closes #20046 

See merge request !5410

app/views/layouts/nav/_dashboard.html.haml

@@ -30,7 +30,7 @@
       %span
         Merge Requests
         %span.count= number_with_delimiter(current_user.assigned_merge_requests.opened.count)
-  = nav_link(controller: :snippets) do
+  = nav_link(controller: 'dashboard/snippets') do
     = link_to dashboard_snippets_path, title: 'Snippets' do
       %span
         Snippets