ci/piglit: Stop including the test counts at the end of expectations.

ci/piglit: Stop including the test counts at the end of expectations.

It's just a ton of fuss for driver developers fixing piglit tests.  This
makes the trace expectation files pretty silly (empty expectation, but
you'll get a diff to a non-empty result when something fails)

Acked-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Acked-by: Adam Jackson <ajax@redhat.com>
Acked-by: Andres Gomez <agomez@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9226>