gh-105431: Remove unused stuff from test_typing.NewTypeTests (#105432)

Author: sobolevn

Lib/test/test_typing.py

@@ -6893,10 +6893,6 @@ def test_c_functions(self):
 
 
 class NewTypeTests(BaseTestCase):
-    def cleanup(self):
-        for f in typing._cleanups:
-            f()
-
     @classmethod
     def setUpClass(cls):
         global UserId
@@ -6909,9 +6905,6 @@ def tearDownClass(cls):
         del UserId
         del cls.UserName
 
-    def tearDown(self):
-        self.cleanup()
-
     def test_basic(self):
         self.assertIsInstance(UserId(5), int)
         self.assertIsInstance(self.UserName('Joe'), str)