Move unnecessary properties from `BeatmapInfo` / realm to `IBeatmap` #28473

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Task	Status
Closes #20883	Incomplete
Supersedes / closes #23418	Incomplete
Needs more testing probably, I've only checked that tests pass	Incomplete
`BeatmapInfo.BeatDivisor` - can't really be moved out of realm because it's used for filtering in song select	Incomplete
`BeatmapInfo.EditorTimestamp` could go live in the `.osu` file but I didn't want to make that change here as I would rather keep this diff strictly menial.	Incomplete
If we're not going to have a general "class of info" that we're passing around, then I think `EpilepsyWarning`/`WidescreenStoryboard` should be moved into `Storyboard`.	Incomplete
`ReplacesBackground` (`BeatmapInfo.Metadata.BackgroundFile`) - probably `BackgroundFile` should be duplicated as a property here.	Incomplete
`GetStoragePathFromStoryboardPath` the directionality looks inverted. It should be `DrawableStoryboard` doing the lookups on resource stores, not what is effectively a model class otherwise.	Incomplete