Consider auto-fold parameterized tests when test cases produce the same serialized data

[Youssef1313]

If test cases produce the same json, the reason will be one of the following:

• Duplicate test case (not realistic use case)
• Type isn't serializable or doesn't round-trip correctly

In this case, it may be a good idea to automatically decide that this test case should be folded, as if serialization failed altogether.

[Youssef1313]

This is no longer important after the changes from #5778. We will revisit if we get more complains around serialization and parameterized tests. Further improvements related to this area are planned in v4 (#5871).