QmlDesigner: Prevent calling the node instance view directly

Views should not write to the node instance view directly. Instead they
should use the model for manipulation.

Change-Id: I3941cc691addab939b8032952230cbe03951730b
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

share/qtcreator/qml/qmlpuppet/interfaces/nodeinstanceglobal.h

@@ -50,4 +50,13 @@ enum class View3DActionType {
     SyncBackgroundColor,
     GetNodeAtPos
 };
+
+constexpr bool isNanotraceEnabled()
+{
+#ifdef NANOTRACE_ENABLED
+    return true;
+#else
+    return false;
+#endif
+}
 }