Introduce E2E tests with Playwright

[pfferrari]

What I did

Introduced E2E tests with Playwright by:

• Setting up the Playwright configuration from scratch
• Adding command line scripts
• Introducing a first spec to test if the app is just working properly with required URL parameters (defined via env file)
• Introducing an app flow spec to test the customer signup and the customer login reusing the same credentials created once and shared between the two steps

Checklist

• Make sure your changes are tested (stories and/or unit, integration, or end-to-end tests).
• Make sure to add/update documentation regarding your changes.
• You are NOT deprecating/removing a feature.

[Copilot]

Pull request overview

Copilot reviewed 12 out of 14 changed files in this pull request and generated 2 comments.

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[malessani]

I suggest you to change the circleci image to be the one specified here: https://playwright.dev/docs/ci#circleci