Support youtube shorts

I don't this this patch works for drupal 10.1. It still applies an accepts the shorts url. However, it won't actually play the video - instead the player directs you to view the video on YouTube.

you can try https://www.youtube.com/watch?v=xyz. xyz is the youtube video id which is the last part of the url. so you have to change https://www.youtube.com/shorts/xyz to https://www.youtube.com/watch?v=xyz. good luck

Works for me

Updated the tests.