[BUG][typescript-angular] Can't handle multiple responses

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

Description

According to the OpenAPI specification it is possible to have multiple response objects per request. The generated code does not represent that.

openapi-generator version

6.1.0
and also reproduced on master

OpenAPI declaration file content or url

TBD

Generation Details

java -jar modules/openapi-generator-cli/target/openapi-generator-cli.jar generate -i modules/openapi-generator-cli/openapi.yml -g typescript-angular -o typescript-angular

Steps to reproduce

Run the command and check the generated code.

Related issues/PRs

https://github.com/OpenAPITools/openapi-generator/issues/5099
https://github.com/OpenAPITools/openapi-generator/issues/1096

Suggest a fix

TBD

Start by running the documented typescript-angular generation command with modules/openapi-generator-cli/openapi.yml and inspect the generated code. The issue does not provide a minimal OpenAPI declaration or actual-versus-expected output, so first establish a reproducible multi-response case and review the related issues. Done means the generated code represents multiple response objects correctly.