Change the admin toolbar to have `role="menu"` and support opening for screen readers. Remove screen reader only log out link and collapse duplicate profile links into one link. This is an imperfect solution to a complex problem in the adminbar, but the lack of screen reader access to submenus is a major accessibility problem, and this fix provides access, even if the mechanism is imperfect.
Screen reader log out added in [21452].
Props abletec, Cheffheid, sabernhardt, alexstine, joedolson, afercia, sparklingrobots, danieltj, swissspidy, netweb, dionysous.
Fixes#34668, #43633.
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