cleanup / modernize user settings (#9937)

* cleanup / modernize user settings form

* add getForm to allow specifying multiple forms + getForm tests

* add user form to users entity and specify in user settings

* init UserSettings integ test

* flow + lint

* make getFormValues work with any wrapper

* fix test

* fix placement of : in FormLabel

* fix up form labels

* remove margin from last radio button item

* flow bits

* update Radio snap to reflect margin change

* address PR feedback

* Flow fixes