Namespace-scoped lists against cluster-scoped objects are no-ops and could be confusing

[joelanford]

ScopeTemplates and ScopeInstances are cluster-scoped objects, which means they do not exist in a namespace. We should remove any usage related to namespaces when we CRUD these resources with the client.

For example:

https://github.com/awgreene/oria-operator/blob/9594791bb669df7572f353346ffd85ee0460bfc7/controllers/scopetemplate_controller.go#L82