Drupal installation, Verify requirements step error message is not escaped properly

This has moved to \Drupal\media\Install\Requirements\MediaRequirements::getRequirements. It's also not in system.module so I'm updating the component.

I think now that this is in a much more isolated function we can use early returns for clarity. Something like this:

public static function getRequirements(): array {
  $requirements = [];
  $destination = 'public://media-icons/generic';
  \Drupal::service('file_system')->prepareDirectory($destination, FileSystemInterface::CREATE_DIRECTORY | FileSystemInterface::MODIFY_PERMISSIONS);
  $is_directory = is_dir($destination);
  $is_writable = is_writable($destination);
  if ($is_directory && $is_writable) {
    return $requirements;
  }
  $t_args = ['%directory' => $destination];
  $error = !$is_directory
    ? $this->t('The directory %directory does not exist.', $t_args)
    : $this->t('The directory %directory is not writable.', $t_args);

  // The rest of the inline template / description bits here.
}