Better handling of insets for All Apps.

Changes:
 - For tablet, always center All Apps without applying additional
   insets for things like cutouts.
 - For tablet, allow the panel to span the full height of the
   screen (minus system bars), rather than 5.5 app rows. This also
   ensures the panel fully closes even if there are cutouts.
 - Remove additional padding for vertical bar mode (landscape on
   phones). This was double counting the cutout insets, but only
   for some views, so things were not aligned. Now the apps line
   up with the search bar, and the scroll bar still makes room for
   any side insets.

Before and after examples:
https://drive.google.com/drive/folders/1k0vSzisf4ZuGyp-qR-IF0QwM-IcHBFrZ?resourcekey=0-uxjzuVQ1KA3WwOQ4v6Dh2w&usp=drive_link

Bug: 299923399
Bug: 259617884
Fix: 300761324
Test: Manual
Flag: NA
Change-Id: I136d516260a1343b1198693c73fa389fe0e11cc9