What is this called, PCB bevelled fingers?
Usually this falls under a 'gold finger' process step. You would communicate to your manufacturer that you need beveled gold fingers, and sometimes you can even specify the exact amount in a mechanical layer or additional mechanical drawing file.

This is not to be confused with V-grooves, which are a separate process, and a way of singulating individual PCBs from a panel.  

In this specific case, they seemed to have gone for carbon instead of gold. My guess would be that since this process already had a carbon layer added for rubber-dome keys (as this is a keyboard), and thus they used that for cost. The reason they use gold in other cases is to avoid contact issues due to oxidation. The same can be achieved with carbon contacts. 

I don't think there is any specific process name for this.