Introduce a new EE::Admin::GroupsController module

Signed-off-by: Rémy Coutable <remy@rymai.me>

app/controllers/admin/groups_controller.rb

 class Admin::GroupsController < Admin::ApplicationController
+  prepend EE::Admin::GroupsController
+
   before_action :group, only: [:edit, :update, :destroy, :project_update, :members_update]
 
   def index
@@ -68,10 +70,10 @@ class Admin::GroupsController < Admin::ApplicationController
   end
 
   def group_params
-    params.require(:group).permit(group_params_ce << group_params_ee)
+    params.require(:group).permit(allowed_group_params)
   end
 
-  def group_params_ce
+  def allowed_group_params
     [
       :avatar,
       :description,
@@ -84,12 +86,4 @@ class Admin::GroupsController < Admin::ApplicationController
       :two_factor_grace_period
     ]
   end
-
-  def group_params_ee
-    [
-      :repository_size_limit,
-      :shared_runners_minutes_limit,
-      :plan_id
-    ]
-  end
 end

ee/app/controllers/ee/admin/groups_controller.rb

+module EE
+  module Admin
+    module GroupsController
+      private
+
+      def allowed_group_params
+        super + [
+          :repository_size_limit,
+          :shared_runners_minutes_limit,
+          :plan_id
+        ]
+      end
+    end
+  end
+end