[UIA] Expose the right UIA_AriaRole for ins & del

This CL exposes "insertion" and "deletion" as AriaRole of the <ins> and
<del> elements, respectively. This will allow ATs to have a way in UIA
to announce that the they are reading is either an insertion or a
deletion.

AriaRole property, allowing NVDA (with UIA mode) to announce them as
such.

Bug: n/a
Change-Id: Icbf93953e5b21efc5189bd08ac92f8c253176b6b
AX-Relnotes: Insertions and deletions are now exposed through the UIA
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4960620
Commit-Queue: Jacques Newman <janewman@microsoft.com>
Reviewed-by: Jacques Newman <janewman@microsoft.com>
Auto-Submit: Benjamin Beaudry <benjamin.beaudry@microsoft.com>
Commit-Queue: Benjamin Beaudry <benjamin.beaudry@microsoft.com>
Cr-Commit-Position: refs/heads/main@{#1213689}