Add auto-detection for Intel GPU on Windows (#16280)
This PR enables `--torch-backend=auto` to automatically detect Intel
GPUs. It follows up on
[#14386](https://github.com/astral-sh/uv/pull/14386).
On Windows, detection is implemented by querying the
`Win32_VideoController` class via the [WMI
crate](https://github.com/ohadravid/wmi-rs/tree/v0.16.0).
Currently, Intel GPUs (XPU) do not depend on specific driver or toolkit
versions to determine which PyTorch wheel to use.
