virgl/ci: Disable virgl-iris-traces-performance

This job has never passed a run in a long time. It fails with
the following error when triggered:

head: cannot open '/dev/dri/renderD128' for reading: No such file or directory

Disable it until it's fixed.

Signed-off-by: Valentine Burley <valentine.burley@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32864>

src/gallium/drivers/virgl/ci/gitlab-ci.yml

@@ -57,7 +57,7 @@ virgl-on-gles:
   variables:
     PIGLIT_REPLAY_EXTRA_ARGS: "--download-caching-proxy-url=${FDO_HTTP_CACHE_URI}"
 
-virgl-iris-traces-performance:
+.virgl-iris-traces-performance:
   extends:
     - .virgl-iris-test
     - .virgl-iris-rules-performance