Logic for setting post-3PCD prefs via BlockThirdPartyCookies policy

See go/3pc-policies-post-3pcd

Bug: 330386195
Change-Id: I90fb5bd8d316dfe7dbb74b35a16cd25f1bcca5ca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5380741


Commit-Queue: Michelle Abreo <michelleabreo@google.com>
Reviewed-by: Fiona Macintosh <fmacintosh@google.com>
Reviewed-by: Kevin Graney <kmg@google.com>
Cr-Commit-Position: refs/heads/main@{#1280246}