Add checkbox to value of tracking call

What does this MR do?

This is something that we need to validate the new project readme experiment. Knowing if the project is being initialized with a readme or not is an important detail that was missed.

Screenshots (strongly suggested)

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content