feat: models delete with new model folder structure

[vansangpfiev]

fixes #1154

[gabrielle-ong]

@sangjanai Edited:
Qn: Do we expect to delete the folder that contains the .gguf and .yml file?

• If there are multiple models in the same folder (when is this the case?) - then we want to delete the files but not the folder

1.cortex models delete tinyllama
2. ✅ cortex models list doesnt have deleted model
3. ❌ .gguf and .yml file is deleted, but not the parent folder eg 1b-gguf

[vansangpfiev]

We do not delete model folder because we can have several models in the same directory.

@gabrielle-ong

[gabrielle-ong]

Noted. Ok, marking as closed, .gguf and .yml files deleted as expected
QA: Windows, Mac, Ubuntu