This decreases flakyness of some tests when runners are under heavy load. https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1555
Based on @ebassi's work from https://gitlab.gnome.org/GNOME/glib/merge_requests/769 This MR allows us to see the succeeded/failed tests each time the CI pipeline is run. https://gitlab.gnome.org/GNOME/mutter/merge_requests/528