Cherry-pick action creator component (#27673)

* Cherry-pick `ModelPicker`

* Cherry-pick actions editor and form components

* Migrate from entity forms

* Remove `ModelPicker`

* Temporarily add "New > Action" flow

* Disable save button if query is empty

* Fix utilities moved

* Fix type errors

* Address comments

* Simplify `ActionForm` tests

* Break down `ActionCreator` props

* Add basic `ActionCreator` tests

* update action creator header gap styling

* Extract `convertActionToQuestionCard`

* Fix `CreateActionForm` ignores action name

* Fix `FormModelPicker` crash

* Address comments

* Remove "New > Action" flow

Co-authored-by: Ryan Laurie <iethree@gmail.com>