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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>. apiserver: enforce global RequestContextMapper in delegation chain Having a request context mapper in the generic config makes it easy to forget setting a common mapper for the whole delegation chain. This PR moves it into the New constructors that already have the delegationTarget argument. So it is obvious that the mapper is passed down as well. Fixes https://github.com/kubernetes/kubernetes/issues/60610