gh-94673: Ensure Builtin Static Types are Readied Properly (gh-103940)

There were cases where we do unnecessary work for builtin static types. This also simplifies some work necessary for a per-interpreter GIL.

Modules/mathmodule.c

@@ -2096,7 +2096,7 @@ math_trunc(PyObject *module, PyObject *x)
         return PyFloat_Type.tp_as_number->nb_int(x);
     }
 
-    if (Py_TYPE(x)->tp_dict == NULL) {
+    if (_PyType_IsReady(Py_TYPE(x))) {
         if (PyType_Ready(Py_TYPE(x)) < 0)
             return NULL;
     }