CI/TST: Disallow usage of pytest.xfail
- [x] closes #38902
- [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them



looks fine, some doc issue in ci / checks. ping on green. @jreback green thanks @rhshadrach 