ci: Make LAVA job fails emit the full list of unexpected test results.

ci: Make LAVA job fails emit the full list of unexpected test results.

When bringing up a new board or starting a new GLES version, we have a lot
of unexpected fails to document, so we need the full list in the log (not
just deqp-runner.sh's head -n 50) so we can populate the xfail list.

Reviewed-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3883>