add sys data to properties (Azure#34549)

Author: nemanjarajic

sdk/ml/azure-ai-ml/azure/ai/ml/entities/_endpoint/online_endpoint.py

@@ -222,12 +222,23 @@ def _from_rest_object(cls, obj: OnlineEndpointData) -> "OnlineEndpoint":
         identity = IdentityConfiguration._from_online_endpoint_rest_object(obj.identity) if obj.identity else None
 
         endpoint: Any = KubernetesOnlineEndpoint()
+
+        if obj.system_data:
+            properties_dict = {
+                "createdBy": obj.system_data.created_by,
+                "createdAt": obj.system_data.created_at.strftime("%Y-%m-%dT%H:%M:%S.%f%z"),
+                "lastModifiedAt": obj.system_data.last_modified_at.strftime("%Y-%m-%dT%H:%M:%S.%f%z"),
+            }
+            properties_dict.update(obj.properties.properties)
+        else:
+            properties_dict = obj.properties.properties
+
         if obj.properties.compute:
             endpoint = KubernetesOnlineEndpoint(
                 id=obj.id,
                 name=obj.name,
                 tags=obj.tags,
-                properties=obj.properties.properties,
+                properties=properties_dict,
                 compute=obj.properties.compute,
                 auth_mode=auth_mode,
                 description=obj.properties.description,
@@ -244,7 +255,7 @@ def _from_rest_object(cls, obj: OnlineEndpointData) -> "OnlineEndpoint":
                 id=obj.id,
                 name=obj.name,
                 tags=obj.tags,
-                properties=obj.properties.properties,
+                properties=properties_dict,
                 auth_mode=auth_mode,
                 description=obj.properties.description,
                 location=obj.location,