UserPackage no longer stores a UserInfo, only a UserHandle, to aid in
mainline modularization. Update Settings to fetch the UserInfo itself
when it needs to show the user name.
Bug: 310653407
Test: atest WebViewAppPickerTest
Flag: NONE cannot flag changed types in method signatures
Change-Id: I0e6f58e6b6a353171ddf923279ff08a92e2f040a