Lib/test: remove expectedFailure decorator from now-fixed tests

Evidently the changes to how we handle `__name__` and `__qualname__`
have fixed the errors we were seeing in test_enum and test_typing.

Lib/test/test_enum.py

@@ -749,16 +749,12 @@ class TestEnum(unittest.TestCase):
         test_pickle_dump_load(self.assertIs, FloatStooges.CURLY)
         test_pickle_dump_load(self.assertIs, FloatStooges)
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_pickle_enum_function(self):
         if isinstance(Answer, Exception):
             raise Answer
         test_pickle_dump_load(self.assertIs, Answer.him)
         test_pickle_dump_load(self.assertIs, Answer)
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_pickle_enum_function_with_module(self):
         if isinstance(Question, Exception):
             raise Question

Lib/test/test_typing.py

@@ -1115,8 +1115,6 @@ class ProtocolTests(BaseTestCase):
         with self.assertRaises(TypeError):
             isinstance(C(), BadPG)
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_protocols_isinstance_py36(self):
         class APoint:
             def __init__(self, x, y, label):
@@ -4257,8 +4255,6 @@ class TypedDictTests(BaseTestCase):
         other = LabelPoint2D(x=0, y=1, label='hi')
         self.assertEqual(other['label'], 'hi')
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_pickle(self):
         global EmpD  # pickle wants to reference the class by name
         EmpD = TypedDict('EmpD', name=str, id=int)