Convert into monorepo

[javierbrea]

From version 2.2 the E2E tests are being executed with many different Cypress versions and configurations. This was made extracting the common Cypress spec files and the application used to run tests to a separated folder, and creating one different E2E folder for each different Cypress version/configuration.

This produced to have many dependencies duplicated on each different Cypress folder, and to repeat some tasks during the execution of different E2E tests, such as the build of the app, etc.

It is desirable to convert the project structure into a monorepo in order to take advantage of monorepo tools such as the tasks orchestration. So, it will be easier and faster to run tests locally as well as in pipelines.

Using a monorepo tool in the project would make very easy to move the core library logic to a new library, allowing to publish a new plugin for managing the sessionStorage by reusing it. #254