Turn "visible" examples into a rule

[Jym77]

As per CG discussion, trying to turn definition's examples into a "rule" to see if we can benefit from the existing machinery to provide these in a testable way to tool implementers.
This is meant as a convenience for tool implementers, not to test any sort of requirements.

We will still need to add a bit of machinery to correctly export these test cases. We want them separated from the actual test cases of actual rules, so that testing them is purely opt-in from implementers.

Closes issue(s):

• Part of How do we test definitions? (Add visibility tests with (horizontal) scroll?) #2081

Need for Call for Review:
This will require a 2 weeks Call for Review (new process)

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[carlosapaduarte]

Looking really good

[carlosapaduarte]

And the visible definition will also have to be edited, because it links to the examples. It should link to the new "rule" instead.

[Jym77]

And the visible definition will also have to be edited, because it links to the examples. It should link to the new "rule" instead.

Yes. Not sure what URL the new "rule" would have, though 😅