Remove Metrics feature flag gate

ee/app/controllers/ee/projects/merge_requests_controller.rb

@@ -43,10 +43,6 @@ module EE
       end
 
       def metrics_reports
-        unless ::Feature.enabled?(:metrics_reports, project)
-          return render json: '', status: :bad_request
-        end
-
         reports_response(merge_request.compare_metrics_reports)
       end
 

ee/spec/controllers/projects/merge_requests_controller_spec.rb

@@ -403,6 +403,8 @@ describe Projects::MergeRequestsController do
   end
 
   describe 'GET #metrics_reports' do
+    let(:merge_request) { create(:ee_merge_request, :with_metrics_reports, source_project: project, author: create(:user)) }
+
     let(:params) do
       {
         namespace_id: project.namespace.to_param,
@@ -413,9 +415,6 @@ describe Projects::MergeRequestsController do
 
     subject { get :metrics_reports, params: params, format: :json }
 
-    context 'when feature is enabled' do
-      let(:merge_request) { create(:ee_merge_request, :with_metrics_reports, source_project: project, author: create(:user)) }
-
     before do
       allow_any_instance_of(::MergeRequest).to receive(:compare_reports)
         .with(::Ci::CompareMetricsReportsService).and_return(comparison_status)
@@ -488,17 +487,4 @@ describe Projects::MergeRequestsController do
       end
     end
   end
-
-    context 'when feature is not enabled' do
-      before do
-        stub_feature_flags(metrics_reports: false)
-      end
-
-      it 'returns no content' do
-        subject
-
-        expect(response).to have_gitlab_http_status(:bad_request)
-      end
-    end
-  end
 end