This commit is a revert of 53e52d2c4b.
Partially done because the workaround is no longer needed, partially
because macOS images have begun to fail after a new image rollout with
bumped NuGet versions.
This is no longer required due to recent changes which mean the
collection database will retain beatmap references even if they aren't
loaded locally (see https://github.com/ppy/osu/pull/18619).
Resolves https://github.com/ppy/osu/issues/18727.
Added delay from `Schedule` should be minimal as it is always called
from the `Update` thread (input propagation) anyway.