Auto merge of #11293 - mrnossiom:11234, r=Jarcho

feat: add cfg_not_test lint

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[lint_naming]: https://rust-lang.github.io/rfcs/0344-conventions-galore.html#lints
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Fixes #11234

changelog: new lint: [`cfg_not_test`]

I don't know whether to lint only the `attr` or also the item associated to it. I guess this would mean putting the check in another place than `check_attribute` but I can't find a way to get the associated item to the attribute.

Also, I'm not sure how to document this lint, I feel like my explications are bad.

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