Automatic merge from submit-queue (batch tested with PRs 61498, 62030). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Delete in-tree support for NVIDIA GPUs.

This removes the alpha Accelerators feature gate which was deprecated in 1.10 (#57384).
The alternative feature DevicePlugins went beta in 1.10 (#60170).

Fixes #54012

```release-note
Support for "alpha.kubernetes.io/nvidia-gpu" resource which was deprecated in 1.10 is removed. Please use the resource exposed by DevicePlugins instead ("nvidia.com/gpu").
```