[Model Monitoring] Log exception trace (mlrun#6544)

* [Model Monitoring] Log exception trace

Development version of mlrun#6542.

[ML-8073](https://iguazio.atlassian.net/browse/ML-8073)

* Keep error in event unchanged

mlrun/model_monitoring/applications/_application_steps.py

@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import json
+import traceback
 from typing import Any, Optional, Union
 
 import mlrun.common.schemas.alert as alert_objects
@@ -164,11 +165,15 @@ def do(self, event):
         error_data = {
             "Endpoint ID": event.body.endpoint_id,
             "Application Class": event.body.application_name,
-            "Error": event.error,
+            "Error": "".join(
+                traceback.format_exception(None, event.error, event.error.__traceback__)
+            ),
             "Timestamp": event.timestamp,
         }
         logger.error("Error in application step", **error_data)
 
+        error_data["Error"] = event.error
+
         event_data = alert_objects.Event(
             kind=alert_objects.EventKind.MM_APP_FAILED,
             entity=alert_objects.EventEntities(