UserSystemPackageInstaller uses user types

UserSystemPackageInstaller was recently introduced and used a subset of
UserInfo flags to specify which package should be installed on which
user.
ag/9507174 introduced the notion of user types to UserManager.

The current cl does the following:

UserSystemPackageInstaller now uses user types instead of UserInfo
flags. This includes both base types (SYSTEM, FULL, PROFILE), as well as
specific user types (like guest, managed profiles, etc.). OEMs can
therefore specify on which type of user each system package should be
installed.

(Installing based on the ephemeral flag is therefore no longer
available, but since it wasn't being used for this purpose, that's
okay.)

Bug: 134605778
Bug: 142151520
Bug: 142482943
Test: atest UserSystemPackageInstallerTest
Change-Id: Ibd6de29e4f4861e91e282edfdd3100dc2d2e2f5f