Fix button group breaking (#50064) (#50133)

* Use Flex instead of Group for items in button

* Allow column picker to stretch to match the height of the element

* Fix height of data picker buttons

* Make sure the whole button is clickable

* Add e2e test for metabase/metabase#50038

* Use correct id for issue in e2e test



---------

Co-authored-by: Romeo Van Snick <romeo@romeovansnick.be>
Co-authored-by: Kamil Mielnik <kamil@kamilmielnik.com>