window/x11: Check before freezing commits

Now that we have a window actor API that can hint whether or not the
window actor would support freezing commits, use it to avoid freezing
Xwayland commit on actors that will not be thawed after paint.

Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/1615
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1678>

(cherry picked from commit a2e2cfe4)