[AiAssistance] Update announcing conversation statuses

This CL:
* Starts announcing the context titles early
* Announces "Answer loading" when the answer starts streaming
* Announces "Answer ready" when the answer is complete

I have tried very hard to accomplish a similar state from the ChatView
DOM but it's not possible (or I couldn't get it right after about 3 hours).

When we mark the step title as `status`, the first step announcement happens, "Answer ready" announcement happens and then the second step announcement happens and there isn't a way on the DOM to do these
updates sequentially.

I think programmatically triggering live announcements is our best way
forward for this.

Fixed: 401064048
Change-Id: I3aadb697dbf0b733bd1938fa0c97892a0890d227
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6732645
Auto-Submit: Ergün Erdoğmuş <ergunsh@chromium.org>
Commit-Queue: Ergün Erdoğmuş <ergunsh@chromium.org>
Reviewed-by: Alex Rudenko <alexrudenko@chromium.org>
2 files changed
tree: e9a361c5b45c4bfd3ce0eb995c52f170e5f15baa
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