cubicweb-datacat #6541083 produced_by/validated_by relations could link to process instead of script [done]

and so we could also remove "produced_from" relation.

prioritynormal
typeenhancement
done in<not specified>
load left0.000
closed by#c228575aedee target of produced_by / validated_by is now the process, not the script
patchtarget of produced_by / validated_by is now the process, not the script [applied]