fix(dependency-injection): register notification handlers for mirrors

- Registers `SecretMirror` and `ConfigMapMirror` as notification handlers for `WatcherEvent` and `WatcherClosed`.
- These were intended to be singletons. Regression from migration from Autofac

Author: winromulus

src/ES.Kubernetes.Reflector/Program.cs

@@ -8,7 +8,9 @@
 using ES.Kubernetes.Reflector.Configuration;
 using ES.Kubernetes.Reflector.Mirroring;
 using ES.Kubernetes.Reflector.Watchers;
+using ES.Kubernetes.Reflector.Watchers.Core.Events;
 using k8s.Models;
+using MediatR;
 
 return await ProgramEntry.CreateBuilder(args).UseSerilog().Build().RunAsync(async _ =>
 {
@@ -23,7 +25,7 @@
     builder.IgniteSeqOpenTelemetryExporter();
     builder.IgniteKubernetesClient();
     builder.Services.AddMediatR(config =>
-        config.RegisterServicesFromAssembly(typeof(Program).Assembly));
+        config.RegisterServicesFromAssembly(typeof(void).Assembly));
 
     builder.Services.Configure<ReflectorOptions>(builder.Configuration.GetSection(nameof(ES.Kubernetes.Reflector)));
 
@@ -34,6 +36,11 @@
     builder.Services.AddSingleton<SecretMirror>();
     builder.Services.AddSingleton<ConfigMapMirror>();
 
+    builder.Services.AddSingleton<INotificationHandler<WatcherEvent>>(sp => sp.GetRequiredService<SecretMirror>());
+    builder.Services.AddSingleton<INotificationHandler<WatcherClosed>>(sp => sp.GetRequiredService<SecretMirror>());
+
+    builder.Services.AddSingleton<INotificationHandler<WatcherEvent>>(sp => sp.GetRequiredService<ConfigMapMirror>());
+    builder.Services.AddSingleton<INotificationHandler<WatcherClosed>>(sp => sp.GetRequiredService<ConfigMapMirror>());
 
     var app = builder.Build();
     app.Ignite();