template_preprocess_form_element_label(&$variables)
Prepares variables for form label templates.
Form element labels include the #title and a #required marker. The label is associated with the element itself by the element #id. Labels may appear before or after elements, depending on form-element.html.twig and #title_display.
This function will not be called for elements with no labels, depending on #title_display. For elements that have an empty #title and are not required, this function w