Fix warnings during tests

[frederikprijck]

Description

Fixes some warnings occuring during running the tests:

• Not using act where we should use it.
• We have our own warnings which polute the test output. So whenever a warning is expected, I mocked the console.warn function instead, and verify it's been called.
• Reworked the test to verify a redirect message shows up now that act was added, which is async.

With the above changes, our console output when running the tests is a lot cleaner:

Testing

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not the default branch