Fully analyze named tuple subclasses in third pass

[ilevkivskyi]

Fixes #5195

The fix is straightforward, previously tuple_type was not analyzed for named tuple subclasses.
I also copy the line number for instance types when transforming them.

[msullivan]

Looks good.

Is there a similar transformation that ought to be done for typeddict_type as well?

[ilevkivskyi]

Is there a similar transformation that ought to be done for typeddict_type as well?

I think no. A subclass of a typed dict is also a typed dict (i.e. it becomes itself a "magic" class), while subclassing a named tuple creates a more "normal" class. But I think it makes sense to add a test just for completeness.