[Tab Group Sync] freezeAndAppendPendingNavigation signal favicon change

If a tab in a tab group is updated on the tab switcher in the
background due to sync the tab's favicon isn't updated. This CL ensures
that the favicon change is recognized and applied.

This update is monitored here:
https://source.chromium.org/chromium/chromium/src/+/main:chrome/android/features/tab_ui/java/src/org/chromium/chrome/browser/tasks/tab_management/TabListMediator.java;drc=cf1c89b50f3bcbd66419b039c8bd492d908ff229;l=519

Fixed: 337256606
Change-Id: I7ae99e1e6ac3d225f7aea347b240b2f1a625c667
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5493327
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1293214}