feat(privatevpn): native port forwarding support (#2285)

internal/portforward/loop.go

@@ -120,6 +120,9 @@ func (l *Loop) run(runCtx context.Context, runDone chan<- struct{},
 		if updateReceived {
 			// Signal to the Update call that the service has started
 			// and if it failed to start.
+			if err != nil {
+				err = fmt.Errorf("starting port forwarding service: %w", err)
+			}
 			updateResult <- err
 		}
 	}