This should be a no-op unless subchannel connection scaling is enabled, and that's controlled by a separate experiment.
See #41029 for implementation.
Closes#41475
COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/41475 from markdroth:pf_experiment_enable a2d316b447
PiperOrigin-RevId: 860319677