ax_dump_tree: use AXInspectScenario

Replacing AXTreeServer::GetPropertyFilters with AXInspectScenario
in order to be able to use more advance filters like the
ones used in Chrome's content_browsertests. The functionality
of ax_dump_tree remains exactly the same as before with this
change.

Bug: n/a
Change-Id: I34264d372e32b93bf1342a7cad73eccbc6009583
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3198785
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/main@{#932079}