Automated cherry pick of #129996: fix: apiserver flagz to response actual parsed flags

[richabanker]

Cherry pick of #129996 on release-1.32.

#129996: fix: apiserver flagz to response actual parsed flags

For details on the cherry pick process, see the cherry pick requests page.

kube-apiserver: fixes a 1.32+ regression validating OIDC and anonymous authentication flags are mutually exclusive to authentication configuration. Fixes an issue where the kube-apiserver `/flagz` endpoint would not respond correctly with parsed flags value.

[k8s-ci-robot]

This cherry pick PR is for a release branch and has not yet been approved by Release Managers.
Adding the do-not-merge/cherry-pick-not-approved label.

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[k8s-ci-robot]

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[liggitt]

/kind regression
/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: eb94ec716221b8fde9e6bafaabb6e7f9295c587b

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: liggitt, richabanker

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Needs approval from an approver in each of these files:

• cmd/kube-apiserver/OWNERS [liggitt]
• pkg/controlplane/OWNERS [liggitt]
• test/OWNERS [liggitt]

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[vinayakankugoyal]

@liggitt - are we good to remove the do-not-merge/cherry-pick-not-approved label?

[dims]

@vinayakankugoyal that will be done by @kubernetes/release-managers