Rudder

When we serialize ReportType in base, for last node compliance for ex, we get:

"rt" : {
"EnforceRepaired" : {}
},

But we really want:

"rt" : "EnforceRepaired",

We do have the first case tested in JsonPostresqlSerializationTest because it was dump from base, and we missed that bit.

Ideally, a correction would be able to deserialize both case and produce only the second.

WARNING: the automatic derivation changes in Scala3 to match what we want, but it means that we need to check all our sealed trait auto-derived encoder (I think it's the only one, but hard to grep)