Zephyr Workbench, a VSCode extension to manage Zephyr on STM32.
It enables users to easily create, develop, and debug Zephyr applications.
Main features:
Install host dependencies.
Import toolchain and SDK.
Create, configure, build and manage apps.
Debug STM32.
You can directly download it from the VSCode marketplace
For more details, visit the Zephyr Workbench
Rebuilding the index in Eclipse did not resolve the errors. However, a re-export from CubeMX and reimport into an Eclipse workspace with no spaces in the path did seems to do the trick.