Mark unstable tests in klyachko.py due to #32773 (#35058)
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### 📚 Description
These two test failures occasionally waste a whole CI run. Here we just
flag them as random so it can be quickly merged, while #32773 is
resolved. Since the issue is already known and reported, there is no
point to keep running these tests.
Note that the issue in question has a needs_review patch but according
to the comments it only solves one of the two tests.
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