ci/deqp: Move .shader_cache artifacts exclusion to the yml.

Less noise in the job log when we want to be highlighting deqp-runner's
output.

Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8206>

.gitlab-ci/deqp-runner.sh

@@ -266,9 +266,6 @@ DEQP_EXITCODE=$?
 echo "System load: $(cut -d' ' -f1-3 < /proc/loadavg)"
 echo "# of CPU cores: $(cat /proc/cpuinfo | grep processor | wc -l)"
 
-# Remove the shader cache, no need to include in the artifacts.
-find $RESULTS -name \*.shader_cache | xargs rm -f
-
 # junit is disabled, because it overloads gitlab.freedesktop.org to parse it.
 # quiet generate_junit $RESULTS_CSV > $RESULTS/results.xml