STYLE: Enable Pylint useless-parent-delegation warning
Associated with #48855.  Enables the Pylint type "W" warning `useless-parent-delegation`.

I have questions about the changes that I made to `test_decimal.py` and `test_numpy.py`.  I'll elaborate in comments below.

- [x] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).

you'll need to run the pre-commit checks too, see the contributing guide for how to do this