[SPIKE] Track missing or removed dependencies for MCU kit

After a kit for Qt for MCUs is created with valid paths for the dependencies is created, it can happen that said dependencies are moved or uninstalled by the user.

This spike is for checking:

• How do the other components that make use of kits (e.g. Qt, Android) deal with this situation (e.g. Android SDK moved).
• In the case of the kits for Qt for MCUs, the dependencies are written in environment vars and/or cmake flags. Compare with the other components to find if this situation is also encountered elsewhere and relevant functionality can be reused.