Replace prepend_entity with prepend_if_ee

(cherry picked from commit 897a9d308db46b620b738b98f2b0e5630ac7d2dd)

config/initializers/0_inject_enterprise_edition_module.rb

@@ -3,8 +3,15 @@
 require 'active_support/inflector'
 
 module InjectEnterpriseEditionModule
-  def prepend_if_ee(constant)
-    prepend(constant.constantize) if Gitlab.ee?
+  def prepend_if_ee(constant, with_descendants: false)
+    return unless Gitlab.ee?
+
+    ee_module = constant.constantize
+    prepend(ee_module)
+
+    if with_descendants
+      descendants.each { |descendant| descendant.prepend(ee_module) }
+    end
   end
 
   def extend_if_ee(constant)

lib/api/entities.rb

@@ -1707,3 +1707,21 @@ module API
     end
   end
 end
+
+# rubocop: disable Cop/InjectEnterpriseEditionModule
+API::Entities.prepend_if_ee('EE::API::Entities::Entities')
+::API::Entities::ApplicationSetting.prepend_if_ee('EE::API::Entities::ApplicationSetting')
+::API::Entities::Board.prepend_if_ee('EE::API::Entities::Board')
+::API::Entities::Group.prepend_if_ee('EE::API::Entities::Group', with_descendants: true)
+::API::Entities::GroupDetail.prepend_if_ee('EE::API::Entities::GroupDetail')
+::API::Entities::IssueBasic.prepend_if_ee('EE::API::Entities::IssueBasic', with_descendants: true)
+::API::Entities::List.prepend_if_ee('EE::API::Entities::List')
+::API::Entities::MergeRequestBasic.prepend_if_ee('EE::API::Entities::MergeRequestBasic', with_descendants: true)
+::API::Entities::Namespace.prepend_if_ee('EE::API::Entities::Namespace')
+::API::Entities::Project.prepend_if_ee('EE::API::Entities::Project', with_descendants: true)
+::API::Entities::ProtectedRefAccess.prepend_if_ee('EE::API::Entities::ProtectedRefAccess')
+::API::Entities::UserPublic.prepend_if_ee('EE::API::Entities::UserPublic', with_descendants: true)
+::API::Entities::Todo.prepend_if_ee('EE::API::Entities::Todo')
+::API::Entities::ProtectedBranch.prepend_if_ee('EE::API::Entities::ProtectedBranch')
+::API::Entities::Identity.prepend_if_ee('EE::API::Entities::Identity')
+::API::Entities::UserWithAdmin.prepend_if_ee('EE::API::Entities::UserWithAdmin', with_descendants: true)