RUST-1088 Always specify error labels at the top level (#553)

Author: isabelatkinson

src/test/spec/json/retryable-writes/README.rst

@@ -119,12 +119,12 @@
           "failCommands": [
             "insert"
           ],
+          "errorLabels": [
+            "RetryableWriteError"
+          ],
           "writeConcernError": {
             "code": 91,
-            "errmsg": "Replication is being shut down",
-            "errorLabels": [
-              "RetryableWriteError"
-            ]
+            "errmsg": "Replication is being shut down"
           }
         }
       },

src/test/spec/json/retryable-writes/bulkWrite-errorLabels.json renamed to src/test/spec/json/retryable-writes/legacy/bulkWrite-errorLabels.json

@@ -58,10 +58,10 @@ tests:
             mode: { times: 1 }
             data:
                 failCommands: ["insert"]
+                errorLabels: ["RetryableWriteError"]
                 writeConcernError:
                     code: 91
                     errmsg: Replication is being shut down
-                    errorLabels: ["RetryableWriteError"]
         operation:
             name: "bulkWrite"
             arguments: