Status code 308 for Permanent Redirect

First step is to not treat it as invalid I'd assume. I will start there. Moved to the 2.x branch

There is likely more work to make it treated like 301, but this at least doesn't mark it as invalid.

Maybe since the redirect functionality is currently being worked on and not functional yet, this is enough to go in as-is?

Applied solution from https://www.drupal.org/project/linkchecker/issues/3441943 📌 Remove validation of "Invalid response code" for administrators Needs review so that we're replacing internal class with status codes in favor of Symfony Response class.

This way we should avoid 99% of problems caused by the incompleteness of allowed status codes in the internal class.

Please review

Awesome 👍♥️

I think we should keep but deprecate the service though, so putting back to needs work

Applied suggestions