Migrate data from core profile

Problem/Motivation

Per Drupal core #1261576: Profile module data is not upgraded, core would not handle migration of core profile data and marked itself as a duplicate of #2957256: Migrate data from Profile2.

Since that issue is now resolved and got rescoped to profile2 module migration only, I'm capturing core profile into this issue.

A few years ago, I was hacking around migrate and managed a manual solution, but that's not a good approach.

Steps to reproduce

- Core profile fields migrated on user entity instead of profile.

Proposed resolution

A few years later/wiser, I think to handle this programmatically:

- Alter to change handling for user profile fields and field instance updating constants, bundle and type static map (hook_migration_plugins_alter)
- Alter d7_user to remove any user profile handling (hook_migration_plugins_alter()).
- Add a migration template similar to d7_user like implemented in #2957256: Migrate data from Profile2. I think that a custom migration class like User implements would work.