Revive Purge DB Script in deployments

[njgheorghita]

The purge db script recently broke our deployment pipeline when deploying the testnet nodes, so it was removed from the deployment script. But it's still a functionality that we'd like to have.

• Figure out what broke and fix the script
• Rename "purge db" script to something like "groom db"
• Re-introduce the groom db step into the deployment pipeline