Remove unused/duplicate services

Emby.Server.Implementations/ApplicationHost.cs

@@ -607,9 +607,6 @@ namespace Emby.Server.Implementations
 
             ServiceCollection.AddSingleton<IAuthenticationRepository, AuthenticationRepository>();
 
-            // TODO: Refactor to eliminate the circular dependency here so that Lazy<T> isn't required
-            ServiceCollection.AddTransient(provider => new Lazy<IDtoService>(provider.GetRequiredService<IDtoService>));
-
             ServiceCollection.AddSingleton<IMediaEncoder, MediaBrowser.MediaEncoding.Encoder.MediaEncoder>();
             ServiceCollection.AddSingleton<EncodingHelper>();
 
@@ -676,8 +673,6 @@ namespace Emby.Server.Implementations
 
             ServiceCollection.AddSingleton<ISubtitleEncoder, MediaBrowser.MediaEncoding.Subtitles.SubtitleEncoder>();
 
-            ServiceCollection.AddSingleton<EncodingHelper>();
-
             ServiceCollection.AddSingleton<IAttachmentExtractor, MediaBrowser.MediaEncoding.Attachments.AttachmentExtractor>();
 
             ServiceCollection.AddSingleton<TranscodingJobHelper>();