Add x-ms-identifier to relay\resource-manager (#17760)

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

Author: LoadBearingBean

specification/relay/resource-manager/Microsoft.Relay/stable/2017-04-01/relay.json

@@ -2147,7 +2147,10 @@
           "readOnly": true,
           "items": {
             "$ref": "#/definitions/Operation"
-          }
+          },
+          "x-ms-identifiers": [
+            "name"
+          ]
         },
         "nextLink": {
           "description": "URL to get the next set of operation list results if there are any.",