Fix pie chart legend issues (#50116) (#50167)

* remove LegendVertical logic that preserves legend width

* memoize pie legend items

* prevent pie from jumping when toggle legend

* fix responsive legend logic, cleanup

* drop hyphens from the pie legend (#29597)

* eliminate flickering on render due to not having dimensions

* shortcut

* specs

* test vertical layout has no hyphens

* setup func

* set explicit showLegend=true default

Co-authored-by: Aleksandr Lesnenko <alxnddr@users.noreply.github.com>