adapt_framework: a11y focus isn't set to unfocusable elements

[oliverfoster]

Subject of the issue

Elements which can normally not receive focus should be forced focus.
This currently only works if preventScroll is set on the focus call.
It should work without the preventScroll flag being true.

[moloko]

to replicate issue, click on any component in PLP then check the value of document.activeElement - it should be the 'heading' div of the component but instead ends up being either the PLP button (Firefox) or the body element (Chrome)