[BUG] [python] generator version > 7.0.0-beta generate broken code for youtrack.

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? (I tested on latest docker image)
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

I trying to generate python client library for youtrack. I am using docker image, and python generator. The command that i use to generate client is following:

docker run --rm -v $PWD:/local openapitools/openapi-generator-cli:v<version> generate -i https://<host>/api/openapi.json -g python -o /local/oclient

Then I install the client using:

sudo python3 setup.py install

Then I try to use it:

python3
import openapi_client

both for python and python-pedantic-v1 generators, I have following error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.10/dist-packages/openapi_client-1.0.0-py3.10.egg/openapi_client/__init__.py", line 20, in <module>
  File "/usr/local/lib/python3.10/dist-packages/openapi_client-1.0.0-py3.10.egg/openapi_client/api/__init__.py", line 4, in <module>
  File "/usr/local/lib/python3.10/dist-packages/openapi_client-1.0.0-py3.10.egg/openapi_client/api/default_api.py", line 28, in <module>
  File "/usr/local/lib/python3.10/dist-packages/openapi_client-1.0.0-py3.10.egg/openapi_client/models/__init__.py", line 18, in <module>
  File "/usr/local/lib/python3.10/dist-packages/openapi_client-1.0.0-py3.10.egg/openapi_client/models/activity_cursor_page.py", line 23, in <module>
  File "/usr/local/lib/python3.10/dist-packages/openapi_client-1.0.0-py3.10.egg/openapi_client/models/activity_item.py", line 24, in <module>
  File "/usr/local/lib/python3.10/dist-packages/openapi_client-1.0.0-py3.10.egg/openapi_client/models/filter_field.py", line 96, in <module>
  File "/usr/local/lib/python3.10/dist-packages/openapi_client-1.0.0-py3.10.egg/openapi_client/models/custom_filter_field.py", line 23, in <module>
  File "/usr/local/lib/python3.10/dist-packages/openapi_client-1.0.0-py3.10.egg/openapi_client/models/custom_field.py", line 113, in <module>
  File "/usr/local/lib/python3.10/dist-packages/openapi_client-1.0.0-py3.10.egg/openapi_client/models/custom_field_defaults.py", line 104, in <module>
  File "/usr/local/lib/python3.10/dist-packages/openapi_client-1.0.0-py3.10.egg/openapi_client/models/build_bundle_custom_field_defaults.py", line 23, in <module>
  File "/usr/local/lib/python3.10/dist-packages/openapi_client-1.0.0-py3.10.egg/openapi_client/models/build_bundle.py", line 23, in <module>
  File "/usr/local/lib/python3.10/dist-packages/openapi_client-1.0.0-py3.10.egg/openapi_client/models/base_bundle.py", line 23, in <module>
  File "/usr/local/lib/python3.10/dist-packages/openapi_client-1.0.0-py3.10.egg/openapi_client/models/bundle.py", line 99, in <module>
ImportError: cannot import name 'BaseBundle' from partially initialized module 'openapi_client.models.base_bundle' (most likely due to a circular import) (/usr/local/lib/python3.10/dist-packages/openapi_client-1.0.0-py3.10.egg/openapi_client/models/base_bundle.py)
>>> 

Then I start downgrade generator and find that v6.5, v7.0.0-beta works fine.

openapi-generator version

Bug exists in: > v7.0.0-beta

OpenAPI declaration file content or url

openapi.json

Generation Details

Steps to reproduce

Just generate python client code, and import it.

Related issues/PRs

Suggest a fix

Reproduce the failure with the attached openapi.json and the Docker generation command, comparing v7.0.0-beta with later versions. Inspect the generated imports in openapi_client/models/bundle.py and base_bundle.py, along with the traceback's related model files. Done means the generated Python client imports without the circular-import error and the regression is covered by an appropriate generator test.