ci/piglit: Move the WGL skip to a common skips file.

This will also give us a central place to handle known CI issues for
piglit.

Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11333>
9 files changed