GRPC Server: Move reflection to a separate gRPC service (#55872)

pkg/server/backgroundsvcs/background_services.go

@@ -51,6 +51,7 @@ func ProvideBackgroundServiceRegistry(
 	_ serviceaccounts.Service, _ *guardian.Provider,
 	_ *plugindashboardsservice.DashboardUpdater, _ *sanitizer.Provider,
 	_ *grpcserver.HealthService,
+	_ *grpcserver.ReflectionService,
 ) *BackgroundServiceRegistry {
 	return NewBackgroundServiceRegistry(
 		httpServer,