Fix loading of EE::Gitlab::RepositorySizeChecker

The EE class for Gitlab::RepositorySizeChecker wasn't correctly loaded.
This change will fix this issue by moving it to the correct path and
adding the prepend to the original class.

ee/lib/ee/gitlab/repository_size_checker.rb

+# frozen_string_literal: true
+
+module EE
+  module Gitlab
+    module RepositorySizeChecker
+      extend ActiveSupport::Concern
+      extend ::Gitlab::Utils::Override
+
+      override :above_size_limit?
+      def above_size_limit?
+        return false unless enabled?
+        return false if additional_repo_storage_available? && total_repository_size_excess <= additional_purchased_storage
+
+        super
+      end
+
+      override :exceeded_size
+      # @param change_size [int] in bytes
+      def exceeded_size(change_size = 0)
+        exceeded_size = super
+        exceeded_size -= remaining_additional_purchased_storage if additional_repo_storage_available?
+        exceeded_size
+      end
+
+      private
+
+      def additional_repo_storage_available?
+        return false unless ::Gitlab::CurrentSettings.automatic_purchased_storage_allocation?
+
+        ::Feature.enabled?(:additional_repo_storage_by_namespace)
+      end
+
+      def remaining_additional_purchased_storage
+        additional_purchased_storage - total_repository_size_excess
+      end
+    end
+  end
+end

ee/lib/gitlab/repository_size_checker.rb

-# frozen_string_literal: true
-
-module Gitlab
-  module RepositorySizeChecker
-    extend ActiveSupport::Concern
-    extend ::Gitlab::Utils::Override
-
-    override :above_size_limit?
-    def above_size_limit?
-      return false unless enabled?
-      return false if additional_repo_storage_available? && total_repository_size_excess <= additional_purchased_storage
-
-      super
-    end
-
-    override :exceeded_size
-    # @param change_size [int] in bytes
-    def exceeded_size(change_size = 0)
-      exceeded_size = super
-      exceeded_size -= remaining_additional_purchased_storage if additional_repo_storage_available?
-      exceeded_size
-    end
-
-    private
-
-    def additional_repo_storage_available?
-      return false unless Gitlab::CurrentSettings.automatic_purchased_storage_allocation?
-
-      Feature.enabled?(:additional_repo_storage_by_namespace)
-    end
-
-    def remaining_additional_purchased_storage
-      additional_purchased_storage - total_repository_size_excess
-    end
-  end
-end

lib/gitlab/repository_size_checker.rb

@@ -42,7 +42,9 @@ module Gitlab
     end
 
     def error_message
-      @error_message_object ||= Gitlab::RepositorySizeErrorMessage.new(self)
+      @error_message_object ||= ::Gitlab::RepositorySizeErrorMessage.new(self)
     end
   end
 end
+
+Gitlab::RepositorySizeChecker.prepend_if_ee('EE::Gitlab::RepositorySizeChecker')