[BUG] [python-experimental] BooleanEnum.TRUE is BooleanEnum(True) fails

[spacether]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

BooleanEnum.TRUE is BooleanEnum(True) fails
This should work because instantiated enums are stored in a class constant in the Singleton class.
BooleanEnum.TRUE.class DynamicDynamicBooleanEnum? It should only have one Dynamic
So it looks like there is an incorrect extra layer of class creation happening here
Track it down and remove it
Then BooleanEnum.TRUE is BooleanEnum(True) will work

openapi-generator version

Latest master branch

OpenAPI declaration file content or url

N/A use the python-experimental sample

Generation Details

N/A

Steps to reproduce

assert BooleanEnum.TRUE is BooleanEnum(True)

Related issues/PRs

This came up when investigating #12151
and writing the fix #12157

Suggest a fix

Remove the extra layer of class creation