fix: redirect warnings in manifest apply k8s client

These warnings by default go to stderr, so to server console and flood
console with messages. Send warnings to the logger, so they stay
within controller-runtime logs.

Signed-off-by: Andrey Smirnov <smirnov.andrey@gmail.com>

internal/app/machined/pkg/controllers/k8s/manifest_apply.go

@@ -142,6 +142,10 @@ func (ctrl *ManifestApplyController) Run(ctx context.Context, r controller.Runti
 				return fmt.Errorf("error loading kubeconfig: %w", err)
 			}
 
+			kubeconfig.WarningHandler = rest.NewWarningWriter(logger.Writer(), rest.WarningWriterOptions{
+				Deduplicate: true,
+			})
+
 			dc, err = discovery.NewDiscoveryClientForConfig(kubeconfig)
 			if err != nil {
 				return fmt.Errorf("error building discovery client: %w", err)