`aamtest` possible improvements: parameterized wpt runs by accessibility API (for windows)

Re comments from James Graham: https://github.com/web-platform-tests/wpt/pull/57696#discussion_r2989935967

For the windows run, we could add a wpt parameter which will only run the IA2 or UIA or both tests. I suppose we should choose one to run by default in this case?
