gh-81057: Move Global Variables Holding Objects to _PyRuntimeState. (gh-99487)

This moves nearly all remaining object-holding globals in core code (other than static types).

https://github.com/python/cpython/issues/81057

Python/Python-ast.c

@@ -263,6 +263,10 @@ void _PyAST_Fini(PyInterpreterState *interp)
     Py_CLEAR(state->vararg);
     Py_CLEAR(state->withitem_type);
 
+    if (_PyInterpreterState_Get() == _PyInterpreterState_Main()) {
+        Py_CLEAR(_Py_CACHED_OBJECT(str_replace_inf));
+    }
+
 #if !defined(NDEBUG)
     state->initialized = -1;
 #else