fix: announce all content inside `role="alert"` (#20056)
close #14990
Summary of the issue:
The content of HTML element with role="alert" had only announced its focusable children contents.
Description of user facing changes:
NVDA now announces all content inside role="alert" elements.
Description of developer facing changes:
Description of development approach:
I extended the condition of what role is announced. I added heading, list, listitem, and paragraph roles.
