[Tab Resume 2.0] Dismissal functionality updates

When an element is removed, it should show the next possible element.
If the list is empty it should remove the module. Undo should bring
the module back with that element that was removed.

Bug: 361798533
Change-Id: Ic97326856418c1cbce4595e0781d39055bdd98d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5894371
Reviewed-by: Roman Arora <romanarora@chromium.org>
Reviewed-by: John Lee <johntlee@chromium.org>
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Commit-Queue: Marlon Facey <mfacey@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1376362}