fix: bashunit-e file isn't created sometimes

[fabriziofs]

📚 Description

Replace this text with a short description of your feature/bugfix.
Fix failing test due to the way sed command behave in macOS, sometimes the file ./bin/bashunit-e isn't created and the test fails:

To avoid this I've added the -f flag to the rm command to in case the ./bin/bashunit-e don't exist the command don't fail and breaks the test, doc related:

🔖 Changes

• Add -f flag to avoid problems with rm command in macOS

✅ To-do list

• I updated the CHANGELOG.md to reflect the new feature or fix
• I updated the documentation to reflect the changes

[Chemaclass]

Thanks!