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

* Refactor Webhook logging to handle exceptions

* Add Exception occured property to WebhookLog.

src/Umbraco.Core/Models/WebhookLog.cs

@@ -25,4 +25,6 @@ public class WebhookLog
     public string ResponseHeaders { get; set; } = string.Empty;
 
     public string ResponseBody { get; set; } = string.Empty;
+
+    public bool ExceptionOccured { get; set; }
 }

src/Umbraco.Core/Models/WebhookResponseModel.cs

@@ -1,8 +0,0 @@
-namespace Umbraco.Cms.Core.Models;
-
-public class WebhookResponseModel
-{
-    public HttpResponseMessage? HttpResponseMessage { get; set; }
-
-    public int RetryCount { get; set; }
-}