Set submission owner when creating using URL parameter

There are security implications for allowing someone to specify the submission owner via query parameter.

ChatGPT suggested the below approach which is a valid solution

/**
 * Implements hook_webform_submission_presave().
 *
 * Allow setting the webform submission owner from a query string parameter.
 */
function MYMODULE_webform_submission_presave(WebformSubmissionInterface $webform_submission) {
  // Check if a query parameter 'submission_owner' exists.
  $owner_uid = \Drupal::request()->query->get('submission_owner');
  
  if ($owner_uid && is_numeric($owner_uid)) {
    // Ensure the user ID exists in the system.
    $user = \Drupal\user\Entity\User::load($owner_uid);

    if ($user) {
      // Set the submission's owner to the user ID from the query string.
      $webform_submission->setOwnerId($owner_uid);
    }
  }
}