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Shutdown http handlers before shutting down audit backend
**What this PR does / why we need it**:
Currently, audit backend is shut down before http handlers stop processing requests, so some audit events can be dropped in case of batching webhook.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#50781
**Special notes for your reviewer**:
**Release note**:
```release-note
Shutdown http handlers in kube-apiserver before shutting down audit backend.
```
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