test(node): workspace 취소 helper를 안정화한다

apps/node/internal/node/workspace_handler_test.go

@@ -37,7 +37,9 @@ func TestNodeWorkspaceCommandHelperProcess(t *testing.T) {
 		if err := os.WriteFile(os.Getenv("IOP_NODE_START_FILE"), []byte("started"), 0o600); err != nil {
 			os.Exit(21)
 		}
-		select {}
+		for {
+			time.Sleep(time.Hour)
+		}
 	default:
 		os.Exit(22)
 	}