backend: remove wgpu, use gk instead to determine GPU info (#603)

Fixes #588 

Removes wgpu, uses open-goal/jak-project#3717
instead.

Tested all 3 scenarios:

![image](https://github.com/user-attachments/assets/1db79212-67fc-496d-a830-b2b89d3cf05a)
> updated gk binary and the gpu test passes


![image](https://github.com/user-attachments/assets/75b1864e-4890-480e-a55f-e60b3387687a)
> no active version is selected


![image](https://github.com/user-attachments/assets/78249bd2-f2f9-4e3c-8487-4003f5365a5f)
> old GK, with no support for outputting the gpu info

This is better in several ways, including that it determines the GPU
that will actually be used by the game (eliminating guess work on
whether the integrated card is being selected or not)