Add aria-describedBy to room list menus

[dbkr]

On VoiceOver this just adds the the name of the room after 'More Options' and 'Notifications' even though it's already been spoken when you focused the room tile, which doesn't seem too helpful to me but it was explicitly requested.

Checklist

• [ ] Tests written for new code (and old code if feasible).
• [ ] New or updated public/exported symbols have accurate TSDoc documentation.
• [ ] Linter and other CI checks pass.
• [ ] I have licensed the changes to Element by completing the Contributor License Agreement (CLA)

[t3chguy]

This seems far too chatty to be a good idea, have you ran this by our a11y community? This seems like an XY problem.

[dbkr]

Have asked the original requester.

[dbkr]

Closing this for now as I haven't heard back,