Inconsistency in the way run statuses are displayed when deserialized vs printed

[KevinCLydon]

The RunStatusEnum type gets converted to a string differently depending on whether it's deserialized using serde (which is what happens in the rest api) or using fmt::Display (which is used when printing or writing to the DB (I think?)). We should make them consistent (ideally always snake_case, probably). Ideally, we should see if there's a way to call into the serde code when using fmt::Display or vice versa.