This update introduces sample data for the planning field service application, allowing developers and testers to work with a realistic scenario. The addition of roles, customers, and tasks improves the ability to thoroughly test the application's functionality and workflows. This enhances the quality assurance process.

This PR adds demo data for the planning field service app, in order to be able to test the application with a realistic dataset.
More precisely, it adds some planning roles, customers, descriptions, projects and tasks to the existing planning slots (interventions).

task-5955800