testnet(amaru): sync amaru from the protected relays, not the producers
amaru-relay-1/2 peered directly with producers p1/p2. Point them at relay1/relay2 instead: these relays are in the fault-exclusion set, so the system-under-test syncs from a stable upstream while only the amaru relays take faults. Add a depends_on so each amaru waits for its relay to start.