Add a gnome-theme testbed and extract the profile name in the default
testbed.
Link: https://github.com/danth/stylix/pull/879
Co-authored-by: Daniel Thwaites <danth@danth.me>
Co-authored-by: NAHO <90870942+trueNAHO@users.noreply.github.com>
Reviewed-by: Daniel Thwaites <danth@danth.me>
Reviewed-by: NAHO <90870942+trueNAHO@users.noreply.github.com>