This ticket follow SERVER-88113 and SERVER-88008 and continues the work to remove SerializationContext. As part of this ticket we should stop adding tenant prefix when serializing database or namespace for commands and stop removing the prefix when deserializing. Essentially this means we can remove the `PrefixState` from `SerializationContext` and only use the `ExcludePrefix` logic. In order to do so, we'll also need to clean tests (stop using prefix) or remove them (if there's already a "mongoq" equivalent for an "atlas proxy" test we can simply remove the "atlas proxy" one because it'll be identical to the mongoq one).