What would you like to be added?

@klueska observed that after uninstalling his DRA driver without removing the Unix Domain socket used for gRPC towards the kubelet, kubelet didn't unregister the driver. We may have to add some liveness probing to pkg/kubelet/cm/dra/plugin/registration.go.

/sign node
/wg device-management
/priority backlog

Why is this needed?

The kubelet needs to remove ResourceSlices on behalf of a defunct DRA driver.