Snapshots - handle minimal RBAC

[sgalsaleh]

[AmberAlston]

@salahalsaleh Suggested copy updates below. Minimal RBAC is a term that isn't really meaningfully to the enterprise customer, so I've updated the copy to be more clear for the end-user

Velero Namespace Access Required

We’ve detected that the Admin Console is running with minimal role-based-access-control (RBAC) privileges, meaning that the Admin Console is limited to a single namespace. To use the snapshots functionality, the Admin Console requires access to the velero namespace. Please run the following command to provide the Admin Console with the necessary permissions to access velero.

[AmberAlston]

Approving now that content changes were updated