Fix regression with sse route clobbering projects

All new project routes should only be under the `/-/` namespace.

config/routes/project.rb

@@ -26,6 +26,10 @@ constraints(::Constraints::ProjectUrlConstrainer.new) do
       scope '-' do
         get 'archive/*id', constraints: { format: Gitlab::PathRegex.archive_formats_regex, id: /.+?/ }, to: 'repositories#archive', as: 'archive'
 
+        scope controller: :static_site_editor do
+          get '/sse/*id', action: :show, as: :show_sse
+        end
+
         resources :artifacts, only: [:index, :destroy]
 
         resources :jobs, only: [:index, :show], constraints: { id: /\d+/ } do

config/routes/repository.rb

@@ -67,10 +67,6 @@ scope format: false do
       end
     end
 
-    scope controller: :static_site_editor do
-      get '/sse/*id', action: :show, as: :show_sse
-    end
-
     get '/tree/*id', to: 'tree#show', as: :tree
     get '/raw/*id', to: 'raw#show', as: :raw
     get '/blame/*id', to: 'blame#show', as: :blame

lib/gitlab/path_regex.rb

@@ -98,7 +98,6 @@ module Gitlab
       preview
       raw
       refs
-      sse
       tree
       update
       wikis