T330512, T332172

This should address the completion criteria for T330512:

• necessary data is identified
• necessary data is extracted from production
• necessary data is added to the Cassandra testing env

and T332172:

• instructions for extracting data are documented within the repo
• script or scripts to pull data (if any) is/are committed to the repo
• instructions for executing the script(s) (if any) are documented within the repo

and the todo tasks documented in https://docs.google.com/document/d/1gpLqXDC8vWLHf0dikL6a0nu2aQNFUO-0FJNaxi7l8tY/edit?pli=1#heading=h.8p0myovw8iit

Additional documentation to be added to the WikiTech page.