av stack tidy doesn't fully remove a deleted branch from the state

[Brookke]

Steps

1. Create a branch via AV
2. Delete branch via Git Couldn't see a way of deleting branches via AV
3. Run stack tidy
4. Run stack sync

Ideal solution

Ensure tidy actually deletes the branch from the av state

[Brookke]

In hindsight I think the actual process to delete the branch should have been to run orphan first, however would appreciate a way of getting out of this if that was forgotten

[draftcode]

av stack tidy was actually meant to be a stop-gap solution. Ideally it's better to transparently remove the internal av-CLI metadata...