turnip/ci: Reduce parallelism of a660-vk
Some `sm8350-hdk` DUTs are currently failing LAVA health checks in the
Collabora farm, reducing available capacity. To mitigate job delays,
temporarily reduce the parallelism of the `a660-vk` job.
Thanks to previous optimizations and further increasing the
tests_per_group setting, there is no loss in test coverage.
Signed-off-by: Valentine Burley <valentine.burley@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35939>
3 files changed
