Prevent invalid high scores from being saved

[thomeval]

This PR adds validation to Band and Solo high scores, meaning that they will be considered invalid and thus not saved when certain conditions are met. This also includes a "Band score not saved" message on the Result screen. Unfortunately, it is not possible to filter out already existing invalid high scores, so the validation rules will only apply to scores set after this PR is merged.

Currently, a band high score will be considered invalid if the Song Speed is less than 100% :

Or if any bots are active:

It will be fairly simple to add more rules later by extending the ScoreContainer.IsSoloScoreValid() and ScoreContainer.IsBandScoreValid() methods.

Known Limitation: In some circumstances, it is possible for a Band Score to be invalid, but a player's Solo Score to still be valid (for example, when playing with bots). In such cases, we should save the player score, but not the band score. Assuming there are no blockers preventing it, this will be addressed in the Solo High Score overhaul PR.

[EliteAsian123]

Hello! Sorry for the late review again.

After some changes below, this should be good to go!

[EliteAsian123]

In some circumstances, it is possible for a Band Score to be invalid, but a player's Solo Score to still be valid (for example, when playing with bots).

For future proofing, it's probably better for this not to be a thing whenever band multipliers and stuff come into play.

[thomeval]

Thanks for the feedback, I've pushed a change that should resolve everything.

[EliteAsian123]

The code is all good! I'm away right now so once I get back I'll test this in-game and this should be good to merge (if one of the other maintainers could do that, that could work too)