feat: Introduce maestro for UI testing

[facumenzella]

Motivation

I've been exploring adding some UI integration tests to cover some basics for customer center. This PR introduces the first test, together with maestro + tuist.

Description

This PR contains two main components:

Maestro

The new example project rc-maestro contains a folder called maestro with a defined structure to add new tests:

• config.yaml points to the available flows
• utils folder with "sub-flows" to use in other proper flows
• `customer_center/feature/test.yaml with different test cases for customer center.

This is called by running maestro test maestro from the root of the example project. The app must be installed before running the command.

Tuist

To avoid adding yet another sample project to our manually maintained workspace, I went this way and quickly introduced tuist. The setup is not final, because we need to migrate more stuff in order to get all the benefits but we will get there eventually.

To generate the rc-maestro project:

1. Install mise https://mise.jdx.dev/installing-mise.html (manage tuist versions)
2. tuist generate

The xcodeproj and xcworkspace are ignored, and can be generated whenever you need the project.

Important

This is not yet integrated in the CI, and some tests might conflict with each other. The plan is to add a cleanup flow to make sure each test leaves the simulator ready.

[ajpallares]

Looks great! Amazing work! Once everything is set up, it's great how easy it seems to be to create tests with Maestro.
A couple of comments though. The main one being that I do really think we should be gitignoring the Derived/ folder

[JayShortway]

Really excited for this (Maestro + Tuist)! Just checked the Maestro flows and they look good! 💪