To be used in the editor, for the beatmap submission wizard.
I've recently been on record for hating "abstract" as a rationale to do
anything, but seeing this commit ~3 months after I originally made it,
it still feels okay to do for me in this particular case. I think the
abstraction is loose enough, makes sense from a code reuse and UX
consistency standpoint, and doesn't seem to leak any particular
implementation details. That said, it is both a huge diffstat and also
potentially controversial, which is why I'm PRing first separately.
Closes https://github.com/ppy/osu/issues/18468.
This doesn't stop the tutorial from downloading a second time, but at
least displays the correct status afterwards. Avoiding the download is a
bit more involved and requires a change to the flow. Probably not worth
it just yet.
To test, recommend switching to production environment, as dev server
doesn't have correct metadata for tutorial resulting in weirdness.
