ci: Enable NIR_VALIDATE everywhere.

I wasted a bunch of time today tracking down a spurious test results
change due to a driver invoking UB by running tests where NIR validation
had failed (instruction reading from components beyond vector size).  If
we need to shrink our coverage to get runtimes down, it will still be
better to be catching validation errors in CI.

To keep the test jobs runtime under 10 minutes, I've split a530's gles2 to
two different jobs.

Acked-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7203>
3 files changed