Adjust levels of technical areas to allow for tested with synthetic data

From pilot kick off:
Dylan: since this is functionality based, I’m not sure whether you need to know if the data is available, then it should be a separate part of the process. A way of doing this could be to say “the functionality has been demonstrated with synthetic data” and then real data. Align with GDI TRLs

The issue names no files, tests, or entry points. Start by reviewing the proposed separation between synthetic and real data and the GDI TRLs; clarify how technical-area levels should change and what “demonstrated with synthetic data” means. Done means the levels and process explicitly distinguish synthetic-data testing from real-data validation.

Written by the indexing model from the issue text.