Implement sanitize done page in SWA

Back to Safety (Sanitize) is a feature that aims to provide a soft reset
for the ChromeOS. In the initial versions, we would reset some ChromeOS
settings, some Chrome settings, and disable extensions. However, in the
future more "soft reset" features would be added to the project (such as
network settings reset). This project is behind a feature flag and was
previously using just a pop up dialog in the ChromeOS Settings. However,
it seems like this feature needs to have a standalone dialog for which
it is being migrated to SWA.
This CL only aims to create a static UI before more technical aspects of
the project are connected to it. Basically for now the Sanitize
process would be ChromeOS Settings -> Run Sanitize -> SWA Done dialog.
And this CL is only focusing on the latter part of this (only SWA).
Once the SWA is set up, the initial running of the feature will be moved
to the SWA as well, as opposed to the current dialog opening inside the
ChromeOS settings.

Screenshot1: https://screenshot.googleplex.com/tqTure8xGXpBNcd
Screenshot2: https://screenshot.googleplex.com/9Q44RyLv5XuEsrV

BUG=b:332697577, b:319446147, b:340724224

Change-Id: I4f58b414733f67d966363165f1bec129c7d8b163
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5581212
Commit-Queue: Behnood Momenzadeh <behnoodm@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: John Admanski <jadmanski@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1315859}