radv/ci: disable kabini's vkd3d job

radv/ci: disable kabini's vkd3d job

The vkd3d update increased its RAM usage above the 4GB of RAM the
kabini has... which leads to amdgpu complaining about not having
enough RAM for command submission.

Let's disable the job until we find a way to lower concurrency or
increase the amount of carveout that could be used for command
submission.

Signed-off-by: Martin Roukala (né Peres) <martin.roukala@mupuf.org>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18346>