[views-ax] Remove a11y getters from ClipboardHistoryItemView

This change removes all usage of accessibility getters from the
ClipboardHistoryItemView's GetAccessibleNodeData method. It doesn't
introduce a change in behavior, since the attributes exposed to
platform accessibility APIs through GetAccessibleNodeData will still
be the same, just without the cache usage.

This change is needed because, with the ViewsAX project, we aim to
maintain a cache of all accessibility attributes to ensure this cache
is only active when needed.

The output of the View::GetAccessibleNodeData overrides will soon be
used to initialize the cache, so they shouldn't be using the cache or
modifying the cache.

This CL is part of the ViewsAX project:
https://docs.google.com/document/d/1Ku7HOyDsiZem1yaV6ccZ-tz3lO2XR2NEcm8HjR6d-VY/edit#heading=h.ke1u3utej413


Bug: 325137417
Change-Id: I19e8c75db660fbefe9a65085083c849452364e6a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5626221
Reviewed-by: Andrew Xu <andrewxu@chromium.org>
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Reviewed-by: Benjamin Beaudry <benjamin.beaudry@microsoft.com>
Auto-Submit: Vinay Singh <vinaysingh@microsoft.com>
Cr-Commit-Position: refs/heads/main@{#1320129}