The `list_theme_updates()` function is a built-in WordPress function that displays the theme update form on the "Themes" page or other pages where it may be used
The `list_plugin_updates()` is a WordPress function that displays the upgrade plugins form, which can be used by calling the function without any parameters
The `rest_convert_error_to_response()` function in WordPress converts an error into a response object, which can be used for proper error handling in RESTful APIs