Merge pull request #23108 from jrafanie/fix_rails_7_deprecation_direc…

…t_descendants

Move to AS::DescendantsTracker.subclasses

spec/models/mixins/supports_feature_mixin_spec.rb

@@ -352,7 +352,7 @@ def define_subclass(module_name, parent, supports_values = {})
   # this cleans out those values so future runs do not have bogus classes
   # this causes sporadic test failures.
   def cleanup_subclass(parent, children)
-    tracker = ActiveSupport::DescendantsTracker.class_variable_get(:@@direct_descendants)[parent]
+    tracker = ActiveSupport::DescendantsTracker.subclasses(parent)
     tracker&.reject! { |child| children.include?(child) }
   end