Link/transfer NegotiationCards and TestSpecs between model versions

[sebastian-echeverria]

Currently, when a new version of a model is created, there is no link to previous artifacts, even though many of them are use for multiple versions. More specifically:

• Design a way to transfer NegotiationCards between model versions. One option would be to handle NegotiationCards outside model versions, at the model level, but this may break a lot of things and may be hard to grasp. Another option is to copy the most recent NegotiationCard to a new model version when the version is created, maybe somehow maintaining the link in that card to previous NegotiationCard versions in previous model versions.
• Design a way to do something similar for TestSpecs. In this case, it may make more sense to do the copy and have the TestSpec be a new starting point.