fix: rework Auth0 API calls to allow large numbers of users

[marius-mather]

Description

AAI-743: need to allow fetching more than 1000 users at a time to properly sync users into the backend from Auth0

Changes

• Update get_all_role_users to use checkpoint-based iteration, page-based only allows 1000 users
• Update sync_auth0_users to use a user export, since otherwise we can't get more than 1000 users
• Update 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.

How to Test Manually (if necessary)

Run uv run pytest

[Copilot]

Pull request overview

Updates Auth0 integration to support syncing more than 1000 users by switching role-user fetching to checkpoint-based iteration and switching full user sync to Auth0’s user export job flow.

Changes:

• Implement checkpoint-based iteration for fetching all users assigned to a role.
• Add Auth0 user export job creation/polling + CSV download/parsing, and update sync_auth0_users to use it.
• Update/extend tests and introduce Faker as a dev dependency for data generation.

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
auth0/client.py	Adds export job APIs + download logic; updates role-user retrieval to support checkpoints.
scheduled_tasks/tasks.py	Introduces ExportedUser, CSV parsing, and switches sync_auth0_users to export-based sync.
tests/test_auth0_client.py	Updates role-user pagination tests and adds a checkpoint-iteration test.
tests/scheduled_tasks/test_tasks.py	Updates sync test to mock exported-user flow instead of paged API calls.
tests/datagen.py	Adds ExportedUserFactory and introduces Faker usage.
pyproject.toml	Adds faker to dev dependencies.
uv.lock	Lockfile update for new dev dependency.