ci/virtio: Generalize .venus-rules

Decouple the .venus-rules definition from lavapipe to prepare for adding
hardware driver coverage for Venus.

Signed-off-by: Valentine Burley <valentine.burley@collabora.com>
Co-authored-by: Guilherme Gallo <guilherme.gallo@collabora.com>
Co-authored-by: Eric Engestrom <eric@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35522>
2 files changed