Display masked database URL during system DB construction

[maxdml]

To help users debug, we should print the database URL.

We can reuse this logic:

dbos-transact-golang/cmd/dbos/utils.go

Line 17 in e79823b

func maskPassword(dbURL string) string {

[af-md]

This task is better suited for someone looking for a good first issue 👍

[vr-varad]

@af-md I would like to work on it!!!