Remove the WarningHeaders feature gate

[ialidzhikov]

/kind cleanup
/sig api-machinery
/priority backlog

Does this PR introduce a user-facing change?

The `WarningHeaders` feature gate that is GA since v1.22 is unconditionally enabled, and can no longer be specified via the `--feature-gates` argument.

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[KEP]: https://github.com/kubernetes/enhancements/tree/master/keps/sig-api-machinery/1693-warnings

[k8s-ci-robot]

Hi @ialidzhikov. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[jpbetz]

/triage accepted
/assign @yliaog

[sftim]

Looks like an extra space has crept in to the release note: WarningHeaders .

[yliaog]

/ok-to-test

[ialidzhikov]

Looks like an extra space has crept in to the release note: WarningHeaders .

Thanks, I now fixed it.

[yliaog]

/lgtm

[ialidzhikov]

/cc @liggitt

[liggitt]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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