Last bits to implement U4-2571 Need to optimize empty recycle bin

src/Umbraco.Web/Strategies/DeleteFilesAfterEmptiedRecycleBin.cs

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+using Umbraco.Core;
+using Umbraco.Core.Events;
+using Umbraco.Core.Logging;
+using Umbraco.Core.Persistence.Repositories;
+
+namespace Umbraco.Web.Strategies
+{
+    /// <summary>
+    /// Represents the DeleteFilesAfterEmptiedRecycleBin class, which subscribes to the
+    /// RecycleBinEmptied event of the <see cref="RecycleBinRepository"/> class
+    /// and is responsible for deleting files attached to the items that were
+    /// permanently deleted from the Recycle Bin - when the Recycle Bin was emptied.
+    /// </summary>
+    public sealed class DeleteFilesAfterEmptiedRecycleBin : ApplicationEventHandler
+    {
+        protected override void ApplicationStarted(UmbracoApplicationBase umbracoApplication,
+            ApplicationContext applicationContext)
+        {
+            RecycleBinRepository.RecycleBinEmptied += RecycleBinRepository_RecycleBinEmptied;
+        }
+
+        void RecycleBinRepository_RecycleBinEmptied(RecycleBinRepository sender, RecycleBinEventArgs e)
+        {
+            var success = sender.DeleteFiles(e.Files);
+
+            if(success)
+                LogHelper.Info<RecycleBinRepository>("All files attached to delete nodes were deleted as part of emptying the Recycle Bin");
+        }
+    }
+}