Grant Kyverno backend permission to update namespaces and use "updatepsa" verb with Rancher

Benjamin Le Diguerherrequested to merge
bld/issue-833 into main

This merge request grants the Kyverno backend permission to update namespaces and use the "updatepsa" verb with Rancher.

It uses a new kustomize unit to create cluster roles and cluster role bindings.

related : #833 (closed)

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