Gets a renderable form array.
This function should be used instead of self::buildForm() when $form_state is not needed (i.e., when initially rendering the form) and is often used as a menu callback.
\Drupal\Core\Form\FormInterface|string $form_arg: The value must be one of the following:
...: Any additional arguments are passed on to the functions called by \Drupal::formBuilder()->getForm(), including the unique form constructor function. For example, the node_edit form requires that a node object is passed in here when it is called. These are available to implementations of hook_form_alter() and hook_form_FORM_ID_alter() as the array $form_state->getBuildInfo()['args'].
array The form array.
public function getForm($form_arg);
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