Make editor hover accessible to screen reader users

[aiday-mar]

This issue is about making the hover accessible to screen reader users. Work has already been done in the following issue (#207592) to add the accessible view/help for the hover. Currently only markdown content is displayed within the hover when the focus is on a markdown hover sub-part. The accessible view/help should show the content of any hover sub-part (for example it should show the diagnostics too).

There are some ongoing discussions about whether it is possible to make the hover accessible without the use of a hover accessible view/help, with simple aria-labels and roles.

[aiday-mar]

A pr was recently merged in order to polish the accessible view/help, to present editor hover information in an accessible way.