BUG Series rolling count ignores min periods
This PR targets 1.0.x branch and is a manual backport for #30923
- [ ] tests added / passed
- [ ] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

you need to clone the 1.0.x branch and cherry-pick this. got it, will close this PR k you could have actually pushed to this branch after you rebased but ok 