gh-109774: Remove duplicated tests from test_enum

[sobolevn]

• Issue: test_enum has duplicate test cases: function vs class based enum definitions #109774

[ethanfurman]

This PR is unnecessary, as the duplicates are intentional -- they are needed to excercise different creation code paths.

[sobolevn]

@ethanfurman can you please elaborate?

the duplicates are intentional -- they are needed to excercise different creation code paths

class TestPlainEnumClass(_EnumTests, _PlainOutputTests, unittest.TestCase):
    enum_type = Enum

class TestPlainEnumFunction(_EnumTests, _PlainOutputTests, unittest.TestCase):
    enum_type = Enum

These two classes are basically the same: the same enum_type, the same base classes.
There's no indirection in test code as well.

How does it help?

[sobolevn]

Oh, I see: f self.__class__.__name__[-5:] == 'Class':
It is hard to grep this part :)