[BUG] [PYTHON] [FAST API] Given supportingFiles-false, APIs still use a not-generated `extra_modules.py`

[urmichm]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
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Description

When setting "supportingFiles" to "false", generated APIs still look for unused and not-generated extra_modules.py

from <SERVICE_NAME>.models.extra_models import TokenModel  # noqa: F401

openapi-generator version

7.x