Add more customizable-<select> appearance oscillation tests

Changing the `appearance` value while the picker is open causes
issues, so be sure any changes to `appearance` close the picker.
This adds further tests that switch appearance via CSS, to ensure
there aren't cycles in style code.

The tests all currently fail. Code needs to be added to close the
picker when the appearance value changes on either the base control
or the picker while the picker is open. There also seem to be
invalidation bugs, e.g. this error `picker should open when clicked
expected true got false` indicates that even though the `appearance`
value is correct in one of the tests, the select cannot be opened.

It appears that some of the linked crash bugs may no longer get hit.

Bug: 40146374,376097114,364924715,364924718
Change-Id: I1a4a0d342ee724f97755ceb49e855becaee40bab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5973354
Auto-Submit: Mason Freed <masonf@chromium.org>
Commit-Queue: Joey Arhar <jarhar@chromium.org>
Reviewed-by: Joey Arhar <jarhar@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1376283}