Prune Branches UI

Hello, I am aware that branches are auto-pruned after some time...However in my situation I'm not sure that's happening. And that's fine with me. I use Azure DevOps as the git and use GitHub Desktop, because I love the UI. I'm not sure if this has been suggested before, but I wanted to drop it here.

Currently, there is no way to manually prune branches in your GitHub Desktop environment without deleting them one-by-one, which takes a lot of clicks (and waiting for large repos). I would like to see a feature where you can mass-delete branches.

Here is my proposed solution:

1. In the UI, go to Repository > Prune Branches in the menu.
2. All the branches will be listed, marking them in red if they are **not** found on the remote, and marking them in **orange** if they have not been committed to in over 30 days. Each branch will have a checkbox next to it. If the branch is to be removed, check the box next to it.
3. Click Prune Branches button at the bottom of the UI. After a final confirmation prompt, all checked branches will be removed from local.

Let me know if you need anything additional!

Thanks in advance!