BUG: Multiple unstack using row index level labels and multi level columns DataFrame
- [x] closes #24729
- [x] closes #28306
- [x] closes #32624
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

This should fix the issue with a long list of indices and unstack. The issue appeared with 6 indices for the first time.

Thanks @phofl This also fixes #24729 and maybe others. can you add a test for those and also add a what's new.
 > This also fixes #24729 and maybe others.

also fixes #28306
 I'll add the tests in the evening Added the tests for both issues and the whats new entry.

Reverted the typo fix. I'll add a pull request separately for this shortly Thanks @phofl!