[BUG][typescript-fetch] allOf with readOnly child parameter: incorrect request interface (missing Omit<...>)

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

There is a POST request and the body uses allOf to combine different structs. If there is a read-only property in a struct, then the generated interface is incorrectly.

It generates:

export interface CreateClubRequest {
    personId: string;
    club?: Club;
}

but it is expected.

export interface CreateClubRequest {
    personId: string;
    club?: Omit<Club, 'name'>;
}

(By the way, it works perfectly if I change the OpenAPI file to:

...
components:
  schemas:
    club:
      properties:
        name:
          readOnly: true
          type: string
          maxLength: 255
        street:
          type: string
          maxLength: 255

)

openapi-generator version

7.9.0-SNAPSHOT

OpenAPI declaration file content or url

openapi: 3.0.3
info:
  version: 1.0.0
  title: Example
  license:
    name: MIT
servers:
  - url: http://api.example.xyz/v1
paths:
  /person/display/{personId}:
    post:
      parameters:
        - name: personId
          in: path
          required: true
          description: The id of the person to retrieve
          schema:
            type: string
      requestBody:
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/club"
      operationId: createClub
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/club"
components:
  schemas:
    club:
      allOf:
        - $ref: '#/components/schemas/owner'
        - $ref: '#/components/schemas/address'

    owner:
      properties:
        name:
          readOnly: true
          type: string
          maxLength: 255

    address:
      properties:
        street:
          type: string
          maxLength: 255

Generation Details + Steps to reproduce

I simple updated modules/openapi-generator/src/test/resources/3_0/allOf-readonly.yaml and run ./generate_clients.sh from this git repository

Related issues/PRs

Suggest a fix

I tried to debug it, but I only find out, that there is some information is missing...

Looks like it is not so simple to implement read-only and write-only perfectly...

Start with modules/openapi-generator/src/test/resources/3_0/allOf-readonly.yaml and reproduce the typescript-fetch output using ./generate_clients.sh. Trace how the generator handles allOf schemas with readOnly properties; done when the generated CreateClubRequest interface uses Omit<Club, 'name'> for the request body.