Remove CustomMetricsHelper from EE module

app/helpers/custom_metrics_helper.rb

 # frozen_string_literal: true
 
-module EE
-  module CustomMetricsHelper
+module CustomMetricsHelper
   def custom_metrics_data(project, metric)
     custom_metrics_path = project.namespace.becomes(::Namespace)
 
@@ -18,5 +17,4 @@ module EE
       'legend' => metric.legend.to_s
     }
   end
-  end
 end