gitlab-ci/deqp: generate xml results for fails/flakes

gitlab-ci/deqp: generate xml results for fails/flakes

Extract .qpa for the individual unexpected results and flakes, and
translate to xml, preserved with the artifacts.  This allows easy
browsing of the test logs for fails/flakes, for easier debugging.

The # of logs to preserve is capped at 50 to avoid saving 100s of
megabytes of logs in case someone pushes a change that breaks
everything.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Acked-by: Eric Engestrom <eric.engestrom@intel.com>