Add regression test for Enum imported as alias (#6798)

Author: DanielNoord

doc/whatsnew/fragments/5776.false_positive

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+Fixed inference of ``Enums`` when they are imported under an alias.
+
+Closes #5776

tests/functional/r/regression_02/regression_5776.py

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+"""Test for a regression with Enums not being recognized when imported with an alias.
+
+Reported in https://github.com/PyCQA/pylint/issues/5776
+"""
+
+from enum import Enum as PyEnum
+
+
+class MyEnum(PyEnum):
+    """My enum"""
+
+    ENUM_KEY = "enum_value"
+
+
+print(MyEnum.ENUM_KEY.value)