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.
Turns out we likely don't want this, as it means the testing user (using
a visual test browser) will not have access to their beatmaps. Can
revisit at a future date if the temporary files are still an issue.
I marked this as headless to avoid it being "ungrouped", but it turns
out this is quite useful to have around and I have searched for it on
multiple occasions.
