fix(clustering) do not include the new fields in the deprecated `/clustering/status` endpoint
fix(clustering) do not include the new fields in the deprecated
`/clustering/status` endpoint

Since we have announced the deprecation of the `/clustering/status` endpoint,
we should not make new database fields available from it. This
encourages people to switch over, but also because we no longer provide any
documentation update to the old endpoint.

Kong/kong,Kong/kong,Kong/kong