BUG: Make DTI/TDI/PI argsort match their underlying arrays
- [x] closes #37863
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

The fix to keep resample working is a kludge I'd like to make unnecessary before merging; cc @mroeschke
@mroeschke will you have time to take a look at this in the not-too-distant future?  if not ill mothball, since its stuck in the mud. lgtm. any user facing change?  > lgtm. any user facing change?

Changes DTi/TDI/PI.argsort, that should be it.