ADA improvements for Select/deselect all options

[carlganz]

Is your feature request related to a problem? Please describe.
As part of the ADA review for a dashboard we developed at the California Department of Public Health, some improvements were identified for the Select/deselect all options. Currently the aria-activedescendant focuses on the elements within the select input and does not include the Select/deselect all buttons, so users are unable to navigate to these buttons by pressing the tab button, but simply rotate through the select options.

Describe the solution you'd like
Ideally aria attributes could be generated that enable users to navigate to the Select/deselect all buttons with the tab key.

Describe alternatives you've considered
For ADA compliance we can remove these buttons, but this hurts overall usability so ideally we can find a way to make these buttons ADA compliant and more inclusive.