[BUG][RUST] Duplicate `oneOf` refs generates uncompilable code.

[ranger-ross]

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

Generating using the Rust client (reqwest-trait) does not compile if there is a oneOf with multiple $refs that point to the same schema.

Error:

error[E0428]: the name `Foo` is defined multiple times
  --> src/models/_v1_foo_patch_200_response.rs:18:5
   |
17 |     Foo(Box<models::Foo>),
   |     --------------------- previous definition of the type `Foo` here
18 |     Foo(Box<models::Foo>),
   |     ^^^^^^^^^^^^^^^^^^^^^ `Foo` redefined here
   |
   = note: `Foo` must be defined only once in the type namespace of this enum

openapi-generator version

7.13.0

OpenAPI declaration file content or url

openapi: 3.0.3
info:
  title: client gen error
  description: ''
  version: 1.0.0
servers: []
paths:
  /v1/foo:
    patch:
      summary: "foo summary"
      description: foo
      responses:
        '200':
          description: foo
          content:
            application/json:
              schema:
                oneOf:
                  - $ref: '#/components/schemas/Foo'
                  - $ref: '#/components/schemas/Foo'
components:
  schemas:
    Foo:
      type: object
      properties:
        bar:
          type: string

Generation Details

generatorName: rust
library: reqwest-trait
additionalProperties:
  supportMiddleware: true
  preferUnsignedInt: true
  topLevelApiClient: true
  useBonBuilder: true
  mockall: true
  enumUnknownDefaultCase: true

Steps to reproduce

1. Copy the spec above
2. Generate the Rust client with the config above
3. Run cargo build and get a compiler error

Related issues/PRs

Suggest a fix

• Option 1: De-duplicate these $refs
• Option 2: Make these schemas fail in openapi-generator validate