Request key for AJAX forms that submit to the form's original route.
This constant is distinct from a "drupal_ajax" value for \Drupal\Core\EventSubscriber\MainContentViewSubscriber::WRAPPER_FORMAT, because that one is set for all AJAX submissions, including ones with dedicated routes for which self::buildForm() should not exit early via a \Drupal\Core\Form\FormAjaxException.
const AJAX_FORM_REQUEST = 'ajax_form';
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