refactor: remove unnecessary mediator subscribers registration

Author: egbakou

src/ES.Kubernetes.Reflector/Program.cs

@@ -42,10 +42,6 @@
     builder.Services.AddHostedService<SecretWatcher>();
     builder.Services.AddHostedService<ConfigMapWatcher>();
 
-    builder.Services.AddSingleton<SecretMirror>();
-    builder.Services.AddSingleton<ConfigMapMirror>();
-
-
     var app = builder.Build();
     app.Ignite();
     await app.RunAsync();