Refactor: Replace EmailSenderWorker with AsyncIniteWorker

Removed EmailSenderWorker and its configuration, including
EmailSenderWorkerConfiguration. Introduced AsyncIniteWorker
as a replacement, simplifying the design by removing
configuration-based toggling.

- Deleted EmailSenderWorkerConfiguration.cs.
- Removed EmailSenderWorker and its registration from Program.cs.
- Registered AsyncIniteWorker in DependencyInjection.cs.
- Renamed and refactored EmailSenderWorker to AsyncIniteWorker.
- Updated namespace and removed unused configuration dependencies.

src/DigitalData.EmailProfiler.Infrastructure/DependencyInjection.cs

@@ -2,6 +2,7 @@ using DigitalData.EmailProfiler.Application.Common.Interfaces;
 using DigitalData.EmailProfiler.Infrastructure.Messaging;
 using DigitalData.EmailProfiler.Infrastructure.Queue;
 using DigitalData.EmailProfiler.Infrastructure.Services;
+using DigitalData.EmailProfiler.Infrastructure.Services.Background;
 using Microsoft.AspNetCore.DataProtection;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
@@ -42,6 +43,9 @@ public static class DependencyInjection
             .PersistKeysToFileSystem(new DirectoryInfo(@"C:\ProgramData\EmailService\Keys"))
             .SetApplicationName("EmailProfiler");
 
+        // Register Background Workers
+        services.AddHostedService<AsyncIniteWorker>();
+
         return services;
     }
 }