Create new drupal user from webform using webform handler and link to CiviCRM existing contact

CreateUserHandler.php

<?php

  namespace Drupal\my_module\Plugin\WebformHandler;

  use Drupal\webform\Plugin\WebformHandlerBase;
  use Drupal\webform\WebformSubmissionInterface;
  use Drupal\user\Entity\User;

  /**
   * Create a new user entity from a webform submission.
   *
   * @WebformHandler(
   *   id = "create_user",
   *   label = @Translation("Create User"),
   *   category = @Translation("Entity creation"),
   *   description = @Translation("Creates a new drupal user."),
   *   cardinality =
   *   \Drupal\webform\Plugin\WebformHandlerInterface::CARDINALITY_UNLIMITED,
   *   results =
   *   \Drupal\webform\Plugin\WebformHandlerInterface::RESULTS_PROCESSED,
   * )
   */
  class CreateUserHandler extends WebformHandlerBase {

    /**
     * {@inheritdoc}
     */
    public function postSave(WebformSubmissionInterface $webformSubmission, $update = TRUE) {
      $user = $this->createUser($webformSubmission);

      // Get the civi contact id for the user and check if they already have a drupal account
      $civicrm = \Drupal::service('civicrm');
      $civicrm->initialize();

      // Get Civi contact ID from Drupal user ID
      try {
        $contact = civicrm_api3('Contact', 'get', [
          'sequential' => 1,
          'return' => ["id"],
          'contact_type' => "",
          'email' => $user->getEmail(),
        ]);

        $cid = $contact['values'][0]['contact_id'];

        //create record in ufmatch to link contact to Drupal record
      }

      catch (CiviCRM_API3_Exception $e) {
        $error = $e->getMessage();
      }

      // Link contact to Drupal account
      /** @var \Drupal\Core\Database\Connection $connection */
      $connection = \Drupal::service('database');

      $result = $connection->insert('civicrm_uf_match')
                           ->fields([
                             'uf_id' => $user->id(),
                             'domain_id' => 1,
                             'uf_name' => $user->getAccountName(),
                             'contact_id' => $cid,
                           ])
                           ->execute();
    }

      /**
     * Create user.
     *
     * @param WebformSubmissionInterface $webformSubmission
     *
     * @return User
     */
    protected function createUser(WebformSubmissionInterface $webformSubmission): User {
      $values = $webformSubmission->getData();
      $email = $values['civicrm_1_contact_1_email_email'];
      $name = mb_substr($values['civicrm_1_contact_1_contact_first_name'], 0, 1, "UTF-8") . '.' . $values['civicrm_1_contact_1_contact_last_name'];
      $name = $this->check_name_exists($name);

      // This needs to go in a validation function for the webform
      //if (user_load_by_mail($email) !== FALSE) {
      //  return "I'm sorry, an account with that email already exists";
      //}

      /** @var User $user */
      $user = User::create();

      // mandatory fields
      //$user->setPassword($webformSubmission->getData('password'));
      $user->setPassword(user_password());
      $user->setEmail($email);

      $user->setUsername($name);
      $user->addRole('applicant');
      $user->enforceIsNew();

      // optional fields
      $user->set('init', $email);
      $user->set('langcode', 'en');
      $user->set('preferred_langcode', 'en');
      $user->set('preferred_admin_langcode', 'en');
      $user->activate();
      $user->save();
      _user_mail_notify('register_no_approval_required', $user);
      //_user_mail_notify('register_admin_created',$user);
      return $user;
    }

    protected function check_name_exists($name) {
      if (user_load_by_name($name) !== FALSE) {
        //if name exists add a random number to the name between 1 and 99 - should work for most cases
        $name = $name . '_' . rand(1,99);
        $this->check_name_exists($name);
      }
      return $name;
    }
  }