[DocsUI M3] Restyle the work profile icon

* Update the briefcase drawable file.
* Reposition the work profile icon in both list view and
  grid view, in list view compact/medium layout, the work
  profile icon is separate from the 2 title rows.

Check the attached bug for the demo.

Bug: 401108078
Test: m DocumentsUIGoogle && manual inspection
Flag: com.android.documentsui.flags.use_material3
Change-Id: I9f7096aa4f03ef15d6f7ed385a3fc185d6c5f67c