[3.12] gh-105431: Remove unused stuff from test_typing.NewTypeTests (…

…GH-105432) (#105489)

gh-105431: Remove unused stuff from `test_typing.NewTypeTests` (GH-105432)
(cherry picked from commit 9d35a71)

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>

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)