DX improvements for local development

[akash1810]

When we run npm -w dev-environment start we:

1. Copy data from CODE to local SQL files (this can take a while)
2. Mount these files into the Postgres container
3. Postgres then performs the INSERT statements to populate the tables

The intention is to have a working local environment is as few steps. However, this only happens if we start with an empty database. If the database is not empty, we still copy data from CODE, but do nothing with it.

Can we improve the DX by:

• Only copying data from CODE if the local database is empty
• Warn when the local database is not empty