docker: Stop dumping long-summary and meson test logs in the CI logs.

I've found that it's hard to find the original error in a dump full of
xserver debug spam for the passing cases, and when I needed to look at
this I end up using a proper editor on the file from the artifacts
view anyway.

Signed-off-by: Eric Anholt <eric@anholt.net>

.gitlab-ci.yml

@@ -81,10 +81,4 @@ meson-build-and-test:
         - meson -Dprefix=/usr build/
         - |
           ninja -C build/ install
-          set +e
-          set -x
           ninja -C build/ test
-          status=$?
-          cat build/meson-logs/testlog.txt
-          cat build/test/piglit-results/xvfb/long-summary || :
-          exit $status