gh-158126: Avoid creating AttributeError for optional Pickler attribute lookups

[lazerg]

Since Pickler got its own tp_getattro for persistent_id, PyObject_GetOptionalAttr() no longer takes its fast path for it, so every dump() builds and clears an AttributeError when it looks up reducer_override, and __init__() does the same for dispatch_table. When the type still uses Pickler_getattr, this now calls _PyObject_GenericGetAttrWithDict() with suppress=1 directly. Pickler_getattr only special-cases persistent_id, so the result is the same. Subclasses that override __getattr__ or __getattribute__ keep the old path.

Fixes #158126

• Issue: pickle.dumps() creates and discards an AttributeError on every call since 3.13.1 #158126