[Policy] Move Shortcut module to contrib

This was discussed at a meeting of the Core Leadership team at DrupalCon Barcelona 2024. Those present agreed to the removing the contact module from core and moving it to contrib. The product managers were not able to attend so tagging for their review.

As mentioned in #3311180-2: [meta] Determine how to make Shortcut module more useful and maintainable → , I still believe shortcut module would be better maintained in contrib. Not a lot has happened in shortcut issue queue since I posted that comment.

So, I'm still+1 for removing it from core and moving it to contrib.

@jibran, thank you.

Removing subsystem maintainer tag becuase @jibran is the maintainer of shortcut..