Build GitLab feature to create sample data for demo and testing purposes

Context from the PM/Eng meeting agenda: https://docs.google.com/document/d/1D9rW65d4w0UwSRw_0jJMRk5wAxdhAd4ynrHLbMMwIjo/edit#bookmark=id.qe6uy3xa0d83

Requirements

• Help customer success go faster but also offer it to anyone.
• Demo env needs helpful content (pre-populated data). Need sample project as GitLab feature.
• Make it super easy/push-button. Populate project with data.
• Driven by Quality data/scripts or import/export behind the scenes.

Duplication of data

Moved to track in #10363 (moved)

Plan

• Review demo projects under the sales/demo project
• Review demo projects under test from quality starting with performance test.
• Work on unblocking the mechanisms to provide a better data structure.
  • import repository/code and do not include any other features (ex. issues, milestones, CI/CD, etc.)
    • Fix: We need to ensure the import and export mechanism support issues, milestones, runner and CI configuration.
  • missing group import/export capabilities that include group-level features and the nested projects in that group.
    • We need to ensure that the import/export capabilities can handle sub group structure.
  • static date stamps that will become stale
    • We need to enhance the API where when we create the project there is a flag to refresh the dates and take the present date when we create the demo project.
• Work on storing demo project data inside the product that can be shipped with GitLab.
  • This can be stored statically as yaml and when we create the project we can rev up the dates.
• Work on mechanism to create the project, this needs to be a GitLab feature facing mechanism.
  • We can start with an MVP page that has a simple UI that takes in the location of the project and a button to start the creation.