Accessibility fixes

[gjones]

Summary

We're trying to ensure that there are no WCAG violations remaining in Click UI.

It looks like a number of components produce the same aria issue:

Flyout, Splitbutton, Autocomplete, Dropdown, Popover, Elements must only use supported ARIA attributes ARIA attribute is not allowed: aria-expanded="false"

Also the grid returns this: Scrollable region must have keyboard access

[rndD]

Related: The plugin to check accessibility issues https://chromewebstore.google.com/detail/axe-devtools-web-accessib/lhdoppojpmngadmnindnejefpokejbdd