Use ClusterRoleBinding for the authenticator role-binding

[hughsaunders]

Required so that the authenticator can authenticate apps in other namespaces.

What does this PR do?

Changes conjur-authenticator-role-binding-{{ CONJUR_NAMESPACE_NAME }} from RoleBinding to ClusterRoleBinding so that the authenticator can authenticate apps in other namespaces.

What ticket does this PR close?

Related: conjurinc/ops#692

Checklists

Change log

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