Cleanup signature for test function getFormObject

Cleanup signature for test function getFormObject

I want to make form test functions available outside core (to wean some extensions off calling methods on the
forms that we no longer call from core. They were copy & paste from when we did). Also, I want to have some nicer form
functions.

I think getFormObject is OK-ish but I don't like the parameters that are there to support
search tests, so I am trying to split that out to allow signature change on the main function