== Background
While working on {T343312} I came to realize that the way the pending results is currently implemented in Menu is not doing a good enough job for assistive technology users like screenreader users.
The ProgressBar is exposed to the users, while indeterminate and while also already provided a “loading” message of some kind. Former is resolved in the original task.
This is under premise that only pending set to `true` Menus are using additions and removals of items.
=== Developer notes
Vue has an upstream bug not allowing for space-separated combinations of aria-relevant values, as the ARIA spec allows for. [[ https://github.com/vuejs/core/issues/9030 | Filed ]].
== Goal
Make the Menu an ARIA `live` region when in pending state.
== Acceptance criteria
[] Add `aria-live="polite"` and consider adding `aria-relevant="additions removals"` to list