Check if --cppcheck-build-dir exists

[samopolacek]

Cppcheck does not report that cppcheck build dir does not exist and also does not report any write issues to the non-existent directory.

This means that cppcheck build dir is actually not used.

We should either create the directory or fail.

[chrchr-github]

On which platform does this happen? It works fine on Windows.

[samopolacek]

I am running cppcheck on Debian 12.

[chrchr-github]

Upon further review, the directory has to be created beforehand on Windows as well.

[firewave]

Please add a cli Python unit test for this.

Also this should be implemented via a function in the Path helper class.

[samopolacek]

• Add a function to Path helper class
• Add cli UT

[samopolacek]

Please add a cli Python unit test for this.

Also this should be implemented via a function in the Path helper class.

@firewave , done from my side. Not sure what to do with the failing checks. I've already tried to rerun them, but they again failed.

[firewave]

Turns out we already had the functionality implemented in the FileLister. I will get rid of the redundant code.