Trigger onCreated/onRemoved on extension API when node visibility changes

This builds on the changes in crrev.com/c/6395501 and sends
onCreated/onRemoved events over the extension API as a result of changes
to permanent folder visibility.

This change is primarily relevant for users with separate local and
account storages, where the node permanent folder visibility can change
based on the visibility of other permanent folders, and whether the
folder itself has children.

Bug: 395071423
Change-Id: Ie05d21ecfa0efd385def5a9b550bf88531a124cb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6394263
Commit-Queue: James Lee <ljjlee@google.com>
Auto-Submit: James Lee <ljjlee@google.com>
Reviewed-by: Kelvin Jiang <kelvinjiang@chromium.org>
Reviewed-by: Devlin Cronin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1464378}