Use prepended where we're prepending

ee/app/models/concerns/ee/protected_ref_access.rb

@@ -10,7 +10,7 @@ module EE
     extend ActiveSupport::Concern
     extend ::Gitlab::Utils::Override
 
-    included do
+    prepended do
       belongs_to :user
       belongs_to :group
 

ee/lib/ee/api/boards_responses.rb

@@ -3,7 +3,7 @@ module EE
     module BoardsResponses
       extend ActiveSupport::Concern
 
-      included do
+      prepended do
         helpers do
           def create_board
             forbidden! unless board_parent.multiple_issue_boards_available?