Make it clearer how --accept ConditionalUpdateRisk maps to a risk like NonZonalAzureMachineSetScaling getting accepted, by turning the previous:

  Reason: accepted NonZonalAzureMachineSetScaling

into:

  Reason: accepted NonZonalAzureMachineSetScaling via ConditionalUpdateRisk

Eventually we'll have an API that allows us to use the conditional-update risk name itself (e.g. --accept NonZonalAzureMachineSetScaling, OTA-1543) , but this via... context will hopefully help avoid confusion in the meantime.