nit: GUI should load from fetch providers async function similar to CLI

[michaelneale]

Currently the CLI will attempt to use the fetch async function on providers that can furnish a list of models, but this isn't surfaced via the desktop (it will need the providers endpoint and probably openapi to change).

[DOsinga]

I think @angelahning was looking at this maybe?

[arujjval]

Hi, I would like to take this on.

[michaelneale]

@arujjval @angelahning did you get anywhere with this?

[angelahning]

was addressed in #4270