feat: check if a Pod is running in user namespace

[prit342]

• In Kubernetes v1.33 support for user namespaces is enabled by default. The new kubesec rule checks if a Pod is running in user namespace instead of host namespace.

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[prit342]

ping @sublimino @06kellyjac for review

[06kellyjac]

Good stuff mate

[sublimino]

Awesome as ever, cheers @prit342 🙌