Automatic merge from submit-queue

etcd component status check should include credentials

- [x] Add TLS credentials into `pkg/genericapiserver.Backend`.
- [x] Add TLS credentials into `pkg/registry/core/componentstatus.Server`.
- [x] `pkg/probe/http.httpProber` should accept the TLS credentials.

Now it is working.

```console
$ kubectl get cs
NAME                 STATUS    MESSAGE              ERROR
scheduler            Healthy   ok
controller-manager   Healthy   ok
etcd-0               Healthy   {"health": "true"}
```

Fixes https://github.com/kubernetes/kubernetes/issues/27343.