Add the auto-delete branch after merge GH action to aiohasupervisor CI and clean up dev branches

[mdegat01]

Description

Apparently aiohasupervisor hasn't had that running and now there's a lot of old dev branches on the repo

Additional context

No response

[github-actions]

Hi @mdegat01, thank you for your contribution!

Task issues are restricted to Open Home Foundation staff and authorized contributors.

If you would like to:

• Report a bug: Please use the bug report form
• Request a feature: Please submit to Feature Requests

If you believe you should have access to create Task issues, please contact the maintainers.