[BUG] [typescript-fetch] anyOf with "number" and "string" leads to empty Interface

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

When using openapi-generator on an openapi.json that inluced anyOf with number and string, the resulting typescript schema is incorrect.

"PostsSchema": {
                "properties": {
                    "content": {
                        "anyOf": [
                            {
                                "type": "number"
                            },
                            {
                                "type": "string"
                            }
                        ],
                        "title": "Content"
                    }
                },
                "title": "PostsSchema",
                "type": "object"
            }

leads to

export interface Content {
}
export interface PostsSchema {
    /**
     * 
     * @type {Content}
     * @memberof PostsSchema
     */
    content?: Content;
}

but it should be content?: number | string; Content should not be an interface I think?.

openapi-generator version

v7.7.0
(https://github.com/OpenAPITools/openapi-generator/releases/tag/v7.7.0)

OpenAPI declaration file content or url

openapi.json

Generation Details

docker run --rm -v ${PWD}:/local openapitools/openapi-generator-cli:v7.7.0 generate -i /local/openapi.json -g typescript-fetch -o /local/out/ts

Steps to reproduce

1. put openapi.json into directory
2. execute cli command above
3. check ./out/ts/models/PostsSchema.ts and Content.ts

for reference here are the files I get:
PostsSchema.ts
Content.ts

Related issues/PRs

Suggest a fix

Run the documented docker generation command with the linked openapi.json, then inspect out/ts/models/PostsSchema.ts and Content.ts. Trace the typescript-fetch generator's handling of the anyOf schema and add or update coverage where the relevant generator behavior is defined. Done means the generated property is content?: number | string and no empty Content interface is produced.