Allow kubeconfig in k8s_defaults and .delete rules

[steeve]

It is now possible to use kubeconfig in k8s_defaults, which we use with k3s internally.
In .delete rules, kubeconfig was ignored, so fix that.

[k8s-ci-robot]

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[smukherj1]

Hi @steeve, Thanks for you PR and sorry for the delayed response. Could you please add a test for this here ensuring the kubeconfig argument is validated for ".delete" in addition to ".apply". Thanks!

[steeve]

Sure.
Amended and rebased.

[smukherj1]

Thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: smukherj1, steeve

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[smukherj1]

/ok-to-test