It's pretty much the same as production software code.

I'm not talking about code to visualize data and present in some form of media. They are part of DS for sure but more for BI and analysts.

For instance, in my previous experience with data science we've built production pipeline to ingest, digest, create model, serve model on some API. The model updates itself every so often, all without human intervention. Code powering something living in production like that would be production DS code imo.