[Edit] Set key on represent

Set key on represent so that commit function can properly persist
configuration per object type.  Add tests to EditRepresenter

Fixes https://github.com/nasa/openmct/issues/1367

platform/commonUI/edit/bundle.js

@@ -374,7 +374,6 @@ define([
                 {
                     "implementation": EditRepresenter,
                     "depends": [
-                        "$q",
                         "$log"
                     ]
                 },