Closes https://github.com/ppy/osu/issues/31915.
Reproduction of aforementioned issue requires 1280x720 resolution, which
should also be a good way to confirm that this does anything.
To me this is also equal-parts-bugfix, equal-parts-code-quality PR,
because tell me: what on earth was this code ever doing at
`ComposeBlueprintContainer` level? Nudging by one playfield-space-unit
doesn't even *make sense* in something like taiko or mania.
This is quite a breaking change, but I think it is beneficial due to the large amount of usage of this class.
I originally intended just to remove the allocations of the two delegates handling the `Changed` flow internally, but as nothing was really using the bindables for anything more than a general "point has changed" case, this felt like a better direction.