Added UserInfo.convertedFromPreCreated

This attribute is useful to identify (on bugreports) whether a
user was created "from scratch" or converted from a pre-created user.

Test: adb shell cmd user list --all -v
Test: adb shell dumpsys user
Test: atest UserControllerTest UserManagerServiceUserInfoTest

Fixes: 165703573

Change-Id: Iee9df636db5677b4d968d49bb5f5b3fbb9a7f02d
Merged-In: Iee9df636db5677b4d968d49bb5f5b3fbb9a7f02d
(cherry picked from commit c5986436a9779bbe9068609062fb231aff37e1d4)