[issue46396] Typing: test invalid usages of `Concatenate`

[Nikita Sobolev]

Nikita Sobolev <mail at sobolevn.me> added the comment:

With this change `typing.py` and `typing_extensions.py` will have different logic: https://github.com/python/typing/blob/523cf0233edc7a29502fbd30dc6bf641a7408e16/typing_extensions/src/typing_extensions.py#L1805-L1811 

Jelle, what should we do?

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nosy: +Jelle Zijlstra

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