gh-108416: Mark slow test methods with @requires_resource('cpu') (GH-108421)

Only mark tests which spend significant system or user time,
by itself or in subprocesses.

Lib/test/test_descr.py

@@ -4457,6 +4457,7 @@ class ClassPropertiesAndMethods(unittest.TestCase):
         o.whatever = Provoker(o)
         del o
 
+    @support.requires_resource('cpu')
     def test_wrapper_segfault(self):
         # SF 927248: deeply nested wrappers could cause stack overflow
         f = lambda:None