Update UserState for the user created during installation

When the installation is only for a specific user, as opposed
to USER_ALL:
1. If the pkg is installed for the first time, and at the same
time a new user is being created, there will be no UserState for
the newer user. It will be created and will reset uninstall reason
in the updateSettingsInternalLI(). The default value of installed
is ture. It is wrong, the pkg should not be installed to the new
user. To fix it, create UserState and set it as not installed when
installation is only for a user.
2. If the pkg is not first installed, the UserState of the new
user will be cleared when update all states from older package
settings that is created when scanning pkg. To fix this issue,
make it not clean all existing UserStates when update from old
package setting.

Bug: 409156628
Flag: EXEMPT bug fix
Test: atest CtsPackageInstallTestCases
Change-Id: I382222f8173c49e1ae68454ee113804254624b29