gitlab CI: hook up junit test reports to the meson results

gitlab CI: hook up junit test reports to the meson results

The KVM tests use this for now, not the container builds where we run meson
directly.

The python script to convert meson test logs to junit results expects suite
names, so let's add all tests to suites so we don't need to carry local
modifications.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>