v0.31.6: [backport v0.31.x] Support Namespace-scoped RBAC (#478)

* add role / rolebinding

* wip

* cleanup

* Support Namespaced RBAC (#477)

* Adding changelog file to new location

* Deleting changelog file from old location

* smh

* generated-code

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Co-authored-by: changelog-bot <changelog-bot>