[BUG] Unnecessary model package import in JSON causes ambiguous class reference

[beikov]

Bug Report Checklist

• [x] Have you provided a full/minimal spec to reproduce the issue?
• [x] Have you validated the input using an OpenAPI validator (example)?
• [x] Have you tested with the latest master to confirm the issue still exists?
• [x] Have you searched for related issues/PRs?
• [x] What's the actual output vs expected output?
• [ ] [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

Using the Jira OpenAPI spec, a model class called JsonNode causes a compilation issue in the generated JSON class, because that unnecessarily imports all model classes.

openapi-generator version

All of them.

OpenAPI declaration file content or url

https://dac-static.atlassian.com/cloud/jira/platform/swagger-v3.v3.json

Generation Details

Use Jersey 2 or 3 with Jackson.

Steps to reproduce

Just generate the models for that spec and observe the compilation error.

Related issues/PRs

https://github.com/OpenAPITools/openapi-generator/pull/20124

Suggest a fix

See PR