The progressive delivery plugin shows the `name`field for nodes, however this name can be an internal ID name that can be difficult to read.  As a user of the plugin, I would like to see a `display_name` field that can be changed to something more readable.  This will require changing [template the creates the topology.json](https://gitlab.cee.redhat.com/service/app-interface/blob/master/resources/services/backstage/saas-promotions.configmap.yaml#L23).  It might require changing app-interface schemas and/or plugin parsing logic.  If a user does not define the `display_name`, it should default to the `name` field.