Add missing routes to make group edits work

Closes #23306

config/routes/group.rb

@@ -3,6 +3,10 @@ require 'constraints/group_url_constrainer'
 constraints(GroupUrlConstrainer.new) do
   scope(path: ':id', as: :group, controller: :groups) do
     get '/', action: :show
+    post '/', action: :create
+    patch '/', action: :update
+    put '/', action: :update
+    delete '/', action: :destroy
   end
 end