Show additional cluster properties

[hjacobs]

It might be valuable to show additional cluster properties (e.g. extracted from Cluster Registry) such as:

• environment ("test", "production" or similar) --- this is important to indicate whether the cluster is "critical" for operations or not
• channel (version channel like "alpha" or "stable")

These properties might also be stored somewhere inside the cluster (ThirdPartyResource or labels?) which would make this feature more generally useful for the community I believe.