Avoid marking ephemeral users for removal if they haven't been logged in

yet.

Previously this was only being done for auto-created guest users. But
this CL extends that behavior beyond guest users and include any not-
yet-logged-in ephemeral users.

It will still be continued to avoid marking an auto-created not-yet-
logged-in ephemeral guest user for removal during boot, which would be
recreated again anyway later in the boot.

This change also improves boot time, because now we don't need to
check for config_guestUserAutoCreated during boot.

Fixes: 352716720
Change-Id: I0e09fb7ac3f4d72bb7053ef6dd67fea7a1657a3a
Test: atest CtsMultiUserHostTestCases
Flag: EXEMPT bugfix