[BUG] If ignore to generate specific models in .openapi-generator-ignore, the model.ts file will still import the un-existing files

Bug Report Checklist

The request model is written in typescript

• 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?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

type exampleRequest = {
    status: 'success';
    details: string;
} | {
    status: 'failed':
    errors: string
}

OpenApi generated 3 models with exampleRequest, exampleRequestOneOf and exampleRequestOneOf2, Since we already have the model type imported, so I added these 3 files in .openapi-generator-ignore file to not generate

/model/exampleRequestOneOf1ts
/model/exampleRequestOneOf1.ts

also added exampleRequest in openapi.config.json in importMapping.

    "importMappings": {
        "exampleRequest": "@foo-service/request"
    }

The OpenApi didn't do the generation, however, the model.ts file still import them, but they are not existing since never generated.

openapi-generator version

3.0.2

OpenAPI declaration file content or url

Generation Details

Steps to reproduce

Related issues/PRs

Suggest a fix

Start with the TypeScript generation path that produces model.ts, then inspect how .openapi-generator-ignore and the openapi.config.json importMappings are applied. Reproduce the issue with the described request union and ignored model files. Done means model.ts does not import model files that were not generated.