[openstreetmap/openstreetmap-website] Support versions in elements multi fetch (PR #3715)

[mmd]

ElementsApiController seems like a good way to maximize code reuse. However, I find things like  `current_model = controller_name.classify.constantize` and `old_model = "Old#{controller_name.classify}".constantize` too difficult to read for a low skilled dev. Given that it would only save us a few lines of code, it feels a bit over-engineered to me.

I wouldn't mind to see a bit more code duplication here, for the sake of better code readability.

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