Test duplicate key behavior in KeyElement

[inteon]

"Investigate whether the original ReadObjectCB function implicitly prevented or handled duplicate key entries in JSON objects. Based on this, create a specific test case to ensure the new json/v2 implementation behaves identically to json-iterator when encountering duplicate keys." - SMD #292 Action items

Adds test case for duplicate keys in KeyElement

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/lifecycle stale

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The Kubernetes project currently lacks enough active contributors to adequately respond to all PRs.

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[kubernetes-prow]

PR needs rebase.

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