Red Hat wants to get rid of libproxy, but we do not want to get rid of proxy autoconfig. So let's do it ourselves. It's not hard.
- Update CI runners to pass CI
- Wants a couple simple tests
- Wants a bubblewrap sandbox
- Cache the pac file instead of downloading it again every time
- Modify gnome-control-center UI to require PAC URL and remove reference to web proxy autodiscovery (no longer supported)