Use ActiveSupport::Concern

ee/lib/ee/api/job_artifacts.rb

 module EE
   module API
     module JobArtifacts
-      def self.prepended(api)
-        api.module_eval do
-          helpers do
-            def authorize_download_artifacts!
-              super
-              check_cross_project_pipelines_feature!
-            end
+      extend ActiveSupport::Concern
+
+      prepended do
+        helpers do
+          def authorize_download_artifacts!
+            super
+            check_cross_project_pipelines_feature!
+          end
 
-            def check_cross_project_pipelines_feature!
-              if job_token_authentication? && !@project.feature_available?(:cross_project_pipelines)
-                not_found!('Project')
-              end
+          def check_cross_project_pipelines_feature!
+            if job_token_authentication? && !@project.feature_available?(:cross_project_pipelines)
+              not_found!('Project')
             end
           end
         end