Automatic merge from submit-queue (batch tested with PRs 60906, 60943). 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>.

Make admission webhooks honor scheme part of url

**What this PR does / why we need it**:
Bug fix, allow webhooks to use the scheme provided in clientConfig, instead of defaulting to http.
(more in issue)

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #60942

```release-note
Bug fix, allow webhooks to use the scheme provided in clientConfig, instead of defaulting to http.
```

/kind bug
/sig api-machinery