Rename classes and variables from Users to Profiles for AI Restructure

As a part of the IA settings restructure, "users" has been changed
to "profiles". This is intended to cover class names and variables.
String names will be handled in a future change.

Bug: 182475505
Test: Ran basic profile operations such as creating, deleting,
switching, and making admin. Ran atest CarSettingsUnitTests

Change-Id: I4bc230460c28779e28b64f009cb644e198b4c0b9
102 files changed