The original implementation was done so in a way that the nested `OsuGame` would be disposed via the async queue, causing a deadlock for 10-20s during test runs. `OsuGameTestScene` was already fixed to avoid this, so consuming it here seems like the easy fix.
The triangles intro tracks video time, which is not adjusted based on
the game's playback rate (ie. it runs in realtime even for headless
tests).
Maybe we want to make the triangles video adjust its rate along with
tests?