BUG: Categorical[dt64tz].to_numpy() losing tz
- [x] closes #26406
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

ok for 1.2, can you add a whatsnew note. whatsnew added + greenish