cubicweb #1857474 skip_copy_for is ignored for object relations [resolved]

skip_copy_for on entity classes can be defined as a tuple of relations to skip during copy but it's only considered for subject relations. I don't see any good reason to ignore it when copying object relations.

done in3.12.10
load left0.000
closed by#73cadb5d0097 [entities] skip_copy_for should be considered for object relations too (closes #1857474)