BUG: df.iloc[:, :1] with EA column
- [x] closes #32957
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

im now thinking the test doesnt belong in extension tests; if it were to fail (e.g. in the status quo), that wouldnt indicate that the EA author needed to fix somthing i think comments have been addressed @jorisvandenbossche, can you confirm? @jorisvandenbossche have your concerns/comments been addressed here? gentle ping @jorisvandenbossche  needs a rebase as well thanks @jbrockmendel 