fixes #12015 by also checking kind of `typeNode` (#12016)

* fixes #12015 by also checking kind of `typeNode`

If a tuple field is aliased it'll appear the same as a ref type in a
call to `getType` if only for the kind of the resulting `NimNode` is
checked (that is a `nnkBracketExpr`)

* fix test case due to #12017 and add more realistic test case

Adds an additional test case, which includes generics and is closer to
the real failure I encountered

* remove previous fix and fix differently after all

The previous fix was incomplete, because it failed for generics.

Note that the `of "tuple"` is not actually needed, the
`nnkBracketExpr` branch in the `else` branch would catch it too, but I
decided to introduce it for clarity. However, the latter is actually
needed, because it seems for aliases of `seq` we end up in it.

* update comment about global `%` proc in json test

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