Remove `card` class after `unlist_ard_columns()`

[ddsjoberg]

Would this interfere with the renaming function?

https://insightsengineering.github.io/cards/latest-tag/reference/rename_ard_columns.html
https://insightsengineering.github.io/cards/latest-tag/reference/unlist_ard_columns.html

[Melkiades]

I checked this and I am not convinced we should do it. It would force the two functions to be used with a precise order but they do/work on different columns... On the other hand, if you want really to specify that is "unlisted", I would just add another class specification (card_unlisted) to the signature

[ddsjoberg]

I think both of these functions currently retain the "card" class, when they no longer fit the definition of a card object. I think we need to remove the class. We could perhaps change the class to card-renamed and card-unlisted and each of these functions could check the inputs objects are either card or one of the others listed above?

[Melkiades]

I understand! I will try with the change of class name, lets see ;)