refactor(archival): ♻ improve IDisposable implementation per S3881

https://rules.sonarsource.com/csharp/RSPEC-3881

services/Archival/FilterLists.Archival.Infrastructure/Persistence/GitFileArchiver.cs

@@ -52,6 +52,12 @@ public void Commit()
         }
 
         public void Dispose()
+        {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+
+        protected virtual void Dispose(bool disposing)
         {
             foreach (var file in _filePaths)
             {