Modernize The CDC/CDF (Non-DLT) Demo

[alexvanadio-databricks]

The CDC Pipeline demo notebook is great, but it could use a little modernization. In particular:

1. UC Support (Catalogs, Volumes, PK/FK constraints)
2. A more realistic gold use case
3. Better code documentation and formatting

And while we're at it:

1. Transition to the new (V2) global setup script
2. Remove dependencies that aren't needed (e.g. requiring an ML DBR for this demo)
3. Minimize the amount of state scattered across %run notebooks so it's easier to reason about the code