A11y: Announce Filter settings on load, and when done

[marvieqa]

Description

When a screenreader user navigates to Filter settings, we don't announce the change of context. We also don't announce the change after filters has been set. Dynamic changes in the page should be announced so that screen reader users are notified.

Recommendation

On Filter load

• We can use aria-live region, then programmatically put the focus on the H2 Filter on load
• Or just programmatically put the focus on the H2 Filter on load.

On Filter - done

• Use aria-live region and announce "results updated"
• Programmatically manage the focus on the results list.

[marvieqa]

We should first implement the filter design/workflow changes described in this slack thread, and then determine whether this ticket is still relevant or can be closed.

[marvieqa]

This is no longer relevant since we've changed the design. Closing issue.