Now that we have the ability to easily define custom rules, add some more to enforce the existing commit message style. Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell-extensions/-/merge_requests/149>
ci-fairy now supports checking commit messages for required/disallowed patterns. Use that to replace our custom commit-log script. Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell-extensions/-/merge_requests/149>