Add combo colour override control to editor

[peppy]

Discussed in #25572

^{Originally posted by lunauii November 25, 2023}
This is a parity feature request from stable to lazer.

Stable currently allows you to manually set the combo color of a combo in a beatmap by expanding the New Combo arrow after selecting the first note in a combo:

In lazer, this currently does not exist or is not in an intuitive position:

This is currently preventing lazer mappers from adding really creative thematic combo sections and instead makes us rely on implementing an excess amount of colors in a map to force a combo color in a specific section.

I'd like there to be a menu toggle when right clicking a combo starter:

or perhaps even a new option in the inspector for combo starters:

It would really help if this would be implemented and would make the laser editor even closer to stable! 🙏