Understand reason of flakey unit tests

Our executeProcess helper produces rarely but noteicable flaky tests. It sometimes called 1 more time. :D 

https://github.com/code-pushup/cli/actions/runs/17213781399/job/48832076600?pr=1082

<img width="996" height="258" alt="Image" src="https://github.com/user-attachments/assets/bbf6e3b8-1f3c-45de-b86f-a73e50deb522" />