[DocsUI M3] Update remaining typography

* Remove unused text appearance.
* Remove unnecessary v31 override.
* Use fontFamilyMedium for certain typography based on the map.
* Remove ActionMode related style/typography because we don't have
  action mode anymore.

Bug: 380761635
Test: m DocumentsUIGoogle && manual inspection
Flag: com.android.documentsui.flags.use_material3
Change-Id: I66f10ac6c384bef3515070ee4adf80c2c4774f1c