Add global alt scroll to adjust volume

[rikimasan]

Relevant Issues:

• Can't change volume using Alt+'mouse wheel' in certain screens #31675
• Unable to change volume in the quick play map selection, ready up and results screen, ect. #35507

Manual Testing Done:

• Opened multiplayer screen to check I can alt+scroll for volume change.
• Opened editor to check I can still do things like ctrl+alt+scroll for distance snap change and scroll the timeline.
• Made sure I can still alt scroll on timeline to adjust zoom

[peppy]

If we're doing this again, the local implementations should probably be undone, along with understanding the implications.

Basically reverting #31146.

[rikimasan]

If we're doing this again, the local implementations should probably be undone, along with understanding the implications.

Basically reverting #31146.

Would you prefer I try to do everything as local implementations or continue with global and remove the existing local implementations?

[peppy]

Honestly having it global seems like "what most people want". But do keep in mind that it needs to be implemented in a way that doesn't take priority away from other elements, which is one of the reasons we retired this in the first place.