Automated cherry pick of #129404: fix: killPodOptions support JSON serialization

[ialidzhikov]

Cherry pick of #129404 on release-1.31.

#129404: fix: killPodOptions support JSON serialization

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[k8s-ci-robot]

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ialidzhikov
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[ialidzhikov]

From the parent PR:
/kind bug
/release-note-none
/priority backlog

[k8s-ci-robot]

@ialidzhikov: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kubernetes-conformance-kind-ga-only-parallel	2e996de	link	true	/test pull-kubernetes-conformance-kind-ga-only-parallel

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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