fix: Adds focus heading behavior for forms with pages (groups) #4201
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Summary | Résumé
Adds focus header behavior for forms with lengthy pages. Focussing the group header (H2) navigates the page to the top and also announces the change (heading title) for AT users.
Test
Create a form with a few pages that have a lot of form elements. I found adding a few address component sets helpful for this. Then try navigating back and forth through the form. For each page navigation, the focus should start at the top of the form.