Add x-ms-identifiers to softwareplan/resource-manager. (#17781)

Co-authored-by: Steven Vukelich <[email protected]>

Author: LoadBearingBean

specification/softwareplan/resource-manager/Microsoft.SoftwarePlan/stable/2019-12-01/softwareplan.json

@@ -481,7 +481,10 @@
           "description": "List of all operations",
           "items": {
             "$ref": "#/definitions/OperationResponse"
-          }
+          },
+          "x-ms-identifiers": [
+            "name"
+          ]
         },
         "nextLink": {
           "type": "string",