Move EE changes to EE module

app/services/boards/create_service.rb

@@ -13,9 +13,6 @@ module Boards
     end
 
     def create_board!
-      set_assignee
-      set_milestone
-
       board = parent.boards.create(params)
 
       if board.persisted?

ee/app/services/ee/boards/create_service.rb

@@ -7,6 +7,14 @@ module EE
       def can_create_board?
         parent.multiple_issue_boards_available? || super
       end
+
+      override :create_board!
+      def create_board!
+        set_assignee
+        set_milestone
+
+        super
+      end
     end
   end
 end