Use _PyObject_LookupAttr() instead of PyObject_GetAttr()

[serhiy-storchaka]

PyObject_GetAttr() followed by PyErr_ExceptionMatches(PyExc_AttributeError) and PyErr_Clear() can be replaced with _PyObject_LookupAttr(). It is faster, because it avoids raising the AttributeError exception which later be caught and dropped at first place. And it leads to simpler code. Most of code already uses _PyObject_LookupAttr(), but some new code was added recently which still use the old idiom.

Linked PRs

• gh-106303: Use _PyObject_LookupAttr() instead of PyObject_GetAttr() #106304
• [3.12] gh-106303: Use _PyObject_LookupAttr() instead of PyObject_GetAttr() (GH-106304) #106568
• [3.11] gh-106303: Use _PyObject_LookupAttr() instead of PyObject_GetAttr() (GH-106304) #106569