Move codequality feature flag to ci features

This commit moves our codequality feature flag to our aggregated
class containing all our ci feature flags.

app/models/ci/pipeline.rb

@@ -1008,7 +1008,7 @@ module Ci
     end
 
     def can_generate_codequality_reports?
-      return false unless Feature.enabled?(:codequality_mr_diff, project)
+      return false unless ::Gitlab::Ci::Features.display_quality_on_mr_diff?(project)
 
       has_reports?(Ci::JobArtifact.codequality_reports)
     end

app/models/merge_request.rb

@@ -1485,7 +1485,7 @@ class MergeRequest < ApplicationRecord
   end
 
   def has_codequality_reports?
-    return false unless Feature.enabled?(:codequality_mr_diff, project)
+    return false unless ::Gitlab::Ci::Features.display_quality_on_mr_diff?(project)
 
     actual_head_pipeline&.has_reports?(Ci::JobArtifact.codequality_reports)
   end

lib/gitlab/ci/features.rb

@@ -71,6 +71,10 @@ module Gitlab
         ::Feature.enabled?(:ci_validate_build_dependencies, default_enabled: :yaml) &&
           ::Feature.disabled?(:ci_validate_build_dependencies_override, project)
       end
+
+      def self.display_quality_on_mr_diff?(project)
+        ::Feature.enabled?(:codequality_mr_diff, project, default_enabled: false)
+      end
     end
   end
 end