Migrate backend to auth0-python v5.0.0

[Copilot]

Auth0-python v5.0.0 introduces breaking changes in the Management API: responses are now Pydantic models instead of dicts, pagination uses a new SyncPager class, and the exception module location changed.

Changes

Management API Client

• Auth0 → ManagementClient with updated initialization syntax
• Auth0Error import moved from auth0 to auth0.authentication.exceptions

Pagination Refactor

• Replaced dict-based pagination (response['users'], response['total']) with SyncPager API
• Used pager.iter_pages() for iteration, pager.items for data, pager.response.total for counts
• Added model_dump() to convert Pydantic models to dicts for backward compatibility with existing code

Test Infrastructure

• Created MockItem and MockPager classes to mock v5 API structure
• Updated all test mocks from dict returns to MockPager instances

Example

# Before (v4)
response = interface.users.list(q=query, fields=fields, page=0, per_page=50)
users.extend(response["users"])
total = response["total"]

# After (v5)
pager = interface.users.list(q=query, fields=fields, page=0, per_page=50)
for page in pager.iter_pages():
    users.extend([user.model_dump() for user in page.items])
total = pager.response.total

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[sentry]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.99%. Comparing base (3e6b6d9) to head (dd84b2c).

Additional details and impacted files

@@                           Coverage Diff                           @@
##           dependabot/pip/back/auth0-python-5.0.0    #2576   +/-   ##
=======================================================================
  Coverage                                   77.99%   77.99%           
=======================================================================
  Files                                         281      281           
  Lines                                       20098    20098           
  Branches                                     2029     2029           
=======================================================================
  Hits                                        15676    15676           
  Misses                                       4376     4376           
  Partials                                       46       46           

Flag	Coverage Δ
frontend	70.03% <ø> (ø)
sharedComponents	61.63% <ø> (ø)

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