Add 120Hz VRR option for displays that have 240Hz, 360Hz, etc.

[portral]

I'm not sure how feasible this is, but for external displays that have higher refresh options, it'd be nice to have intermediate VRRs if possible, I .e. a 4K 240Hz display could do 120Hz, a 360Hz could do 240Hz or even 120Hz, etc.

I'm not sure how feasible or easy it would be to do, but it might help with some of the VRR issues macOS has with flickering and such, depending on the software or content being used, etc.

[waydabber]

Moved here: #4404