REGR: DataFrame.apply() with raw option and func returning string
- [ ] closes #35940
- [ ] tests added / passed
- [ ] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

thanks @simonjayhawkins nicely documented work-around @meeseeksdev backport 1.1.x