More configurable options in Ops Dashboard Details

[KatyHaddock]

The ability turn on and off contents in the configuration of the feature details widget is really helpful but it would be even better to be able to choose which fields are visible. 

[patrickb]

@KatyHaddock The details element simply leverages a layer's configured popup. Authoring a popup is typically done in the Map Viewer, and duplicating that experience in Dashboards is not in our product plans at this time. Should this idea gain more traction in the community, we'd be happy to re-open it.