Fix trace query

Fix trace query for `GetError`.

Author: martincostello

docker/docker-compose-aspnetcore/http/oats.http-geterror.yaml

@@ -7,9 +7,13 @@ expected:
     - traceql: '{ span.http.route =~ "api/HttpClient/GetError" }'
       spans:
         - name: 'GET api/HttpClient/GetError'
+          attributes:
+            http.request.method: GET
+        - name: 'GET'
           attributes:
             error.type: '500'
             http.request.method: GET
+            http.response.status_code: '500'
   metrics:
     - promql: http_client_request_duration_seconds_count{}
       value: '>= 0'