[BUG][typescript-axios] Incorrect request body name

Created by: epidemia

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?

Description

Request body name from x-codegen-request-body-name is ignored for composed schema.

openapi-generator version

5.1.1

OpenAPI declaration file content or url

{
  "post": {
    "tags": [
      "entities"
    ],
    "summary": "Creates a new entity",
    "operationId": "createEntity",
    "x-codegen-request-body-name": "body",
    "requestBody": {
      "content": {
        "application/json": {
          "schema": {
            "description": "Input data",
            "oneOf": [
              {
                "$ref": "#/components/schemas/First"
              },
              {
                "$ref": "#/components/schemas/Second"
              },
              {
                "$ref": "#/components/schemas/Third"
              }
            ]
          }
        }
      }
    }
  }
}

Generation Details

openapi-generator-maven-plugin:5.1.1

Expected request param name: body Actual request param name: firstSecondThird

Steps to reproduce

Use the openapi-generator-maven-plugin and typescript-axios template