The replica set flow control project aims to keep majority committed replication lag bounded. Tests that set up replica sets with arbiters, e.g., apply_batch_only_goes_forward.js may time out when the flow control mechanism is enabled. The flow control mechanism is intentionally disabled when majority read concern is disabled. Enabling majority read concern with a PSA replica set is not a supported configuration, so disable majority read concern in tests that use PSA replica sets to avoid timeouts.