Multipart/form-data support for dynamic form form discriminator

Content & configuration

If I configure a schema using a discriminator and oneOf, the form automatically generated is incomplete

Example of configuration:

openapi: 3.0.1
info:
  title: Unknown Service
  description: ''
  version: v1.0.1
paths:
  '/example':
    post:
      tags:
        - category
      summary: category.create
      description: not documented
      operationId: category.create
      requestBody:
        content:
          multipart/form-data:
            schema:
              $ref: '#/components/schemas/ProductTypeFieldDef'
        required: true
      responses:
        '200':
          description: not documented

components:
  schemas:
    Str:
      required:
        - isRequired
        - name
        - validations
      type: object
      properties:
        regex:
          type: string
        name:
          type: string
        isRequired:
          type: boolean
        minLength:
          type: integer
          format: int32
        maxLength:
          type: integer
          format: int32
        type:
          type: string
          example: Str  
    Bool:
      required:
        - isRequired
        - name
        - validations
      type: object
      properties:
        name:
          type: string
        isRequired:
          type: boolean
        type:
          type: string
          example: Bool  
    ListItems:
      required:
        - isRequired
        - item
        - name
        - validations
      type: object
      properties:
        name:
          type: string
        isRequired:
          type: boolean
        maxSize:
          type: integer
          format: int32
        minSize:
          type: integer
          format: int32
        item:
          $ref: '#/components/schemas/ProductTypeFieldDef'
        type:
          type: string
          example: ListItems  
    ProductTypeFieldDef:
      allOf:
        - required:
            - isRequired
            - name
            - type
          type: object
          properties:
            isRequired:
              type: boolean
            name:
              type: string
        - discriminator:
            propertyName: type
          oneOf:
            - $ref: '#/components/schemas/ListItems'
            - $ref: '#/components/schemas/Bool'
            - $ref: '#/components/schemas/Str'
  

Is your feature request related to a problem?

No

Describe the solution you'd like

1. I would like to have a select box to select one of the values of the discriminator
2. I would like that dynamically show/hide the input, depending on the discriminator selected

Describe alternatives you've considered

I'm considering to implement it by myself, but if you guys could help with the places that i need to change would be very useful.

Additional context

Start with Swagger UI's dynamic form generation for the multipart/form-data schema in the issue's OpenAPI example, focusing on discriminator and oneOf handling. Trace how the form currently renders the ProductTypeFieldDef schema and identify existing tests for generated request forms. Done means a discriminator value selector changes the displayed inputs for each oneOf option and the behavior is covered by tests.