[marius-mather]

Description

AAI-885: update user syncing for AAF accounts.

Changes

• Reworked user syncing to account for AAF users and the different account types we have now:
  • Auth0 database connection users
  • Auth0 database connection users, linked to an AAF account
  • AAF only users
• Allow converting between account types during sync, where we can clearly identify the change.
  NB:: we expect account types to change through the backend's API endpoints, so this should
  not normally occur during sync - only there as a fallback.
• Fix an issue where AAF users might not have their account type set.
• Unit tests

Checklist

• I have commented my code, particularly in hard-to-understand areas
• I have added unit / integration tests that prove my fix is effective or that my feature works
• I have run all tests locally and they pass
• I have updated the documentation (if applicable)
• For any new secrets, I have updated the shared spreadsheet and the GitHub Secrets.

Example sync results

Existing Auth0 account:

User sync showing account change:

Linked account after sync:

[amandazhuyilan]

Looks good - good to add these changes in while we work on switching between AAF and non-AAF accounts