chore(tests): corejs update and wrap fetchMock.restore()/reset() in arrow functions for…

[katesaikishore]

Core-js update@latest and Wrap fetchMock hooks in arrow functions for Jest hooks

Update

• Primary task: Upgraded fetch-mock to v9.11.0, which removed [email protected] and now depends on [email protected].
• Interim work: Fixed Jest hook errors by wrapping fetchMock.restore() and fetchMock.reset() in arrow callbacks.
• Changes committed on branch chore/wrap-fetchmock-hooks with message:
  chore(tests): wrap fetchMock hooks in arrow functions for Jest hooks

Changes

• Bumped fetch-mock from v7.7.3 → v9.11.0 (core-js 2 → 3 upgrade).
• beforeEach(fetchMock.restore) → beforeEach(() => fetchMock.restore())
• afterEach(fetchMock.reset) → afterEach(() => fetchMock.reset())

Testing

1. → All tests pass without hook-related failures.
2. Verified mocking behavior in the example/ app flows to ensure no regressions.

Scope

This change updates existing tests only (no new public APIs)

References

• Jest error during test runs:

  Test functions cannot both take a 'done' callback and return something.

• fetch-mock deprecation warning:
  https://github.com/wheresrhys/fetch-mock#setup-and-teardown
• Jest docs on setup/teardown hooks:
  https://jestjs.io/docs/setup-teardown

Checklist

• I have read the Auth0 general contribution guidelines
• All existing and new tests complete without errors
• All active GitHub checks have passed

Testing

1. Run all unit tests:

   npm test