Issue Type: Feature Request

It would be great if was could hide pruned branches in the branch drop downs.

Also related it would also be nice to hide tags based on naming convention from the list to. I still want some tags, but if I could hide tags with a -Bnnnnn extension that would be awesome.

VS Code version: Code 1.36.1 (2213894, 2019-07-08T22:59:35.033Z)
OS version: Windows_NT x64 10.0.18362