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[BUG][Go] Golang client code is incorrect with presence of oneOf/allOF

See original GitHub issue

Description

We discovered that with presence of oneOf/allOf we have presence of UNKNOWN_BASE_TYPE instead of interface{} (or other know type)

OpenAPI Generator versions

Version tested :

5.0.1
master

OpenAPI file

I tested a very simple openAPI v3 file :

openapi: 3.0.1
info:
  description: test
  title: test
  version: 1.5.0
servers:
- url: v1
paths:
  /pets:
    patch:
      requestBody:
        content:
          application/json:
            schema:
              discriminator:
                propertyName: pet_type
              oneOf:
              - $ref: '#/components/schemas/Cat'
              - $ref: '#/components/schemas/Dog'
      responses:
        "200":
          description: Updated
components:
  schemas:
    Pet:
      discriminator:
        propertyName: pet_type
      properties:
        pet_type:
          type: string
      required:
      - pet_type
      type: object
    Dog:
      allOf:
      - $ref: '#/components/schemas/Pet'
      - $ref: '#/components/schemas/Dog_allOf'
    Cat:
      allOf:
      - $ref: '#/components/schemas/Pet'
      - $ref: '#/components/schemas/Cat_allOf'
    Dog_allOf:
      properties:
        bark:
          type: boolean
        breed:
          enum:
          - Dingo
          - Husky
          - Retriever
          - Shepherd
          type: string
      type: object
    Cat_allOf:
      properties:
        hunts:
          type: boolean
        age:
          type: integer
      type: object