Bug #49925: mgr/dashboard: adapt Dashboard to work with NFSv4
mgr/dashboard: duplicated NFS export rows on orchestrator-managed NFS clusters.
When an NFS export is created in an orchestrator-managed NFS cluster
and the dashboard setting for user-defined clusters is set
with the same pool & namespace as the orchestrator:
ceph dashboard set-ganesha-clusters-rados-pool-namespace <pool/namespace>
Then we see 2 rows for the same export.