CI: Skip flaky CS test on VirGL

We've seen this crash a few times over the past couple of weeks, but
haven't yet managed to reproduce locally and fix. In the meantime, just
skip.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6352>
2 files changed