Description:
This PR removes the sqltrace package in favor of an explicit sqldrv package that handles the retry logic. The listener code has also been updated to use the built-in methods for accessing raw DB connections without needing a separate connection pool.

The existing tracing code isn't used/maintained, so the only important bit was the retry logic. This is part of the cleanup work for the switchover refactor.

Review
Add a second instance of goalert to Procfile.local (create if it doesn't exist)

goalert2: ./bin/goalert -l=localhost:3032 --ui-dir=web/src/build --db-url=postgres://goalert@localhost

• Test normal application operation (smoketest & cypress tests should be sufficient).
• Ensure listener code works (update config, observe reload in goalert2)