feat(react 19): update react to 19, testing libraries deps to latest …

[leefreemanxyz]

…and fix broken tests. Closes #818

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Description

The purpose of this PR is to enable compatability with React 19 without the need for legacy-peer-deps flag in npm.

Updating to React 19 had further knock on effects that required updating testing libraries dependencies. This caused significant breakage in the unit tests due to deprecated functionality being used, which have now been fixed and should be passing.

Testing

The unit tests have been adjusted to be passing, otherwise all behaviour should be identical - I have not tested/run the examples.

• 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
• [X ] The correct base branch is being used, if not the default branch