V13: Log webhook firing exceptions when they happen (#15393)

* Refactor Webhook logging to handle exceptions

* Add Exception occured property to WebhookLog.

src/Umbraco.Web.Common/Models/WebhookLogViewModel.cs

@@ -37,4 +37,7 @@ public class WebhookLogViewModel
 
     [DataMember(Name = "responseBody")]
     public string ResponseBody { get; set; } = string.Empty;
+
+    [DataMember(Name = "exceptionOccured")]
+    public bool ExceptionOccured { get; set; }
 }