Automatic merge from submit-queue (batch tested with PRs 56681, 57384). 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>.
Deprecate the alpha Accelerators feature gate.
Encourage people to use DevicePlugins instead.
/kind cleanup
Related to https://github.com/kubernetes/features/issues/192 and https://github.com/kubernetes/features/issues/368
**Release note**:
```release-note
The alpha Accelerators feature gate is deprecated and will be removed in v1.11. Please use device plugins instead. They can be enabled using the DevicePlugins feature gate.
```
/sig node
/sig scheduling
/area hw-accelerators
7706957324