For csolution TZ examples: store `cbuild-set.yml` file

[ReinhardKeil]

TZ examples require both the Secure and Non-Secure part to be compiled.

As the IDE selects just the first project of a solution when cbuild-set.yml is missing, this file needs to be part of multi-project files that require more then just on project to work.

[MiloradCvjetkovic]

This is already prepared in the pull request here . Take a notice that with VSC extensions it is not working as expected at the moment as stated in the issue .

[MiloradCvjetkovic]

Addressed with commit 5e32195801cfcb9a2c8267cf118dfb0e09dd5b3b .