Create optional test data for headstart.

[ArchitectedDev]

For demoing and quick start purposes, providing test data will allow onboarding devs to have more context towards expected entity relationships created as part of headstart, as well as a complete interactive set of data for end-to-end testing from completion of the seeding processes.

The Habitat test data is a recommended starting point for creating headstart test data as it contains quite an extensive test data that developers may also be familiar with from XC.