Webhook log authorization and file system path checks (#19177)

* Add authorization for webhooks to item and log endpoints.

* Remove full path details from exception when requesting a path outside of the physical file system's root.

* Added missing usings.

* Revert changes to the webhook items API

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Co-authored-by: kjac <kja@umbraco.dk>

src/Umbraco.Core/IO/PhysicalFileSystem.cs

@@ -358,7 +358,7 @@ namespace Umbraco.Cms.Core.IO
 
             // nothing prevents us to reach the file, security-wise, yet it is outside
             // this filesystem's root - throw
-            throw new UnauthorizedAccessException($"File original: [{originalPath}] full: [{path}] is outside this filesystem's root.");
+            throw new UnauthorizedAccessException($"Requested path {originalPath} is outside this filesystem's root.");
         }
 
         /// <summary>