
Automatic merge from submit-queue (batch tested with PRs 57868, 58284, 56370, 58400, 58439). 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>.
Fix decoding of admission config file
Fixes #58426
1a552bbe14 (diff-eb9532eb476083e1ab31da9dd6f83eceR41)
attempted to use a locally constructed scheme, but the name `scheme` was shadowed by a function arg.
Attempts to run the apiserver with a structured plugin config file would fail to decode (since the passed scheme didn't know about the AdmissionConfiguration type), then fall back to treating the file as a legacy config, and silently continue without correct config
```release-note
kube-apiserver: fixes loading of `--admission-control-config-file` containing AdmissionConfiguration apiserver.k8s.io/v1alpha1 config object
```
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