Fix AttributeError doctests when output includes a suggestion (part of python 3.12 support) #36403
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In python 3.12, attribute errors add a suggestion at the end of the
usual error message ("Did you mean ...?").
We add ... at the end of these doctest outputs to fix it.
This PR is split in two commits:
Since this changes a lot of files and is bound to get old, I'd appreciate a quick review + merge to avoid trouble (the PR is long but almost trivial and the review should be easy).
I'll soon make a separate PR (on top of this one) with the rest of the support python 3.12 changes, which are maybe not so trivial but much shorter than this one.
Related: #36181
@mkoeppe 🙏