web console: display and edit decomissioningNodes in Historicals list #8862
Description
Druid 0.15 added the decommissioningNodes dynamic coordinator config setting to allow you to designate some historicals as "decommissioning"; it would transfer segments off of them until they are empty.
Druid 0.16 added the ability to edit this setting as a string array to the CoordinatorDynamicConfigDialog.
However, it would be great if there was more visibility into this setting: decommissioning nodes should be marked somehow in the Historicals list on the Data Servers page, and it should be possible to add them directly to the decommissioning list from their entry rather than needing to edit an array in a separate dialog box.
Perhaps this means that this value needs to be accessible via SQL.