CLN: Another unused script
xref https://github.com/pandas-dev/pandas/pull/37825

Another script that looks unused and undocumented

> LGTM, maybe should get an opinion from a windows user

@simonjayhawkins maybe? i tend to use git bash as the terminal rather than anaconda prompt so never use this (or test_fast.bat). Have just tested in anaconda prompt and the scripts both work.

if the scripts are undocumented then I guess no harm in removing. I kept the `test_fast.*` scripts since they were documented in `contributing.rst`. I'll move forward with removing this one, thanks