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

Peter Hutterer requested to merge whot/libevdev:wip/meson-junit-results into master

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.

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