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Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. Let client ca post start hook use GET to check if the system namespace exists This is a direct fix for #56761. The original code tried to create a namespace unconditionally, it caused apiserver to fail to reboot if a webhook blocked namespaces creation. In the long term, we should make the apiserver return 409 instead of 5xx in the case of conflicting POST, even if a webhook fails the POST.