[MCU] importPaths are not passed to qmlprojectexporter

Steps to reproduce

1. Load the attached project, MyProject/MyProject.qmlproject
2. Click "Run Project" or "Live Preview"

Outcomes
The preview fails to start. We see this error in the Compile Output pane:

Screen01.ui.qml:2:1: error: The module 'MyModule' could not be found in the include paths.

Workaround 1: Manually pass the import path to qmlprojectexporter

1. Enable "View" > "Mode Selector Style" > "Icons and Text"
2. Select "Projects" mode (Ctrl+5)
3. Expand "Run Settings" > "Qt for MCUs Deploy Step"
4. Add this to the "Arguments" field: --include-dirs "<path>/<to>/MyExternalComponents"

Workaround 2: Treat the project as a Desktop project instead of an MCU project

In the *.qmlproject file, comment out the line, QDS.qtForMCUs: true

This disables qmlprojectexporter and the preview runs correctly.