Run performance tests with dedicated network services

[ThetaSinner]

We should not use production network services (signal + TURN) for performance testing because

1. It will affect production users to put heavy load on them.
2. Sharing these services will affect results. It wouldn't invalidate them exactly, but it would make the results harder to interpret and make them more variable.

We need to decide what to run and where, then switch over the conductor-config.yaml that gets used by trycp scenarios to configure network services for trycp-spawned conductors.

[ThetaSinner]

Low priority for now because we think the production services will scale

• keep an eye on cloudflare billing for sbd
• keep using runid for network seeds to keep test runs separate