Ruff fixes

[ubmarco]

• activate ruff preview mode & auto format the whole code base
• dedicated file include list for linting (ruff-lint.toml), so it can be separated from formatting list
• fix ruff configuration deprecations
• fix all ruff lint issues in utils.py and horizontal_box.py
• no re-using of envs for tox.ini
• min coverage of 80% for py312 env