[3.11] gh-98724: Fix Py_CLEAR() macro side effects (#99100) #99288
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The Py_CLEAR(), Py_SETREF() and Py_XSETREF() macros now only evaluate their argument once. If an argument has side effects, these side effects are no longer duplicated.
Add test_py_clear() and test_py_setref() unit tests to _testcapi.
(cherry picked from commit c03e05c)