Chore: add stories and test to validate that `authProvider` works

[adguernier]

Q	A
Branch?	main for features
Tickets	Following #535
License	MIT
Doc PR	WIP

This PR attempts to validate that passing a React-admin authProvider to the <HydraAdmin> component as a prop works well.

It adds some Stories and interactions tests running thanks to Storybook and Playwright.

You might read the CONTRIBUTING.md first to know how to test this PR.

Todo:

• [x] add stories to demonstrate the authProvider prop
• [x] add E2E tests
• [x] update CHANGELOG.md file