cubicweb #12481591 Entity.copy_relations should ignore computed relations [validation pending]

it makes no sense to copy computed relations

prioritynormal
typebug
done in3.22.3
load0.500
load left0.000
closed by#9e926f2dc84d [entity] Exclude computed relations from Entity.copy_relations
patch[entity] Exclude computed relations from Entity.copy_relations [applied]