* refactor(tests): simplify string validation in tests Introduce a helper function `validate_strings` to streamline the validation of expected and excluded strings in test cases. Replace repetitive string assertions in the `test_markitdown_local` function with calls to this new helper, improving code readability and maintainability. * run pre-commit --------- Co-authored-by: lumin <71011125+l-melon@users.noreply.github.com> Co-authored-by: gagb <gagb@users.noreply.github.com>