utilize UserService for SAML (#4748)

src/Command/CreateUserCommand.php

@@ -76,7 +76,7 @@ final class CreateUserCommand extends AbstractUserCommand
         }
 
         try {
-            $this->userService->saveNewUser($user);
+            $this->userService->saveUser($user);
             $io->success(sprintf('Success! Created user: %s', $username));
         } catch (ValidationFailedException $ex) {
             $this->validationError($ex, $io);