[BUG] typescript-fetch unique item array with primitives in response body is not wrapped into Set

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator?
• 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

Unique item array with primitives in response body is not wrapped into Set and that is causing failures if someone wants to call operations available in Set class.

npm notice run npx
npm notice run tsx test-set-response.ts
Result: [ 'a', 'b', 'c' ]
Is Set: false
Is Array: true
Test failed with error: TypeError: result.has is not a function
    at run (C:\Users\wojci\IdeaProjects\openapi-generator-wza\samples\client\petstore\typescript-fetch\builds\set-type-mappings\test-set-response.ts:21:40)

openapi-generator version

7.25.0

OpenAPI declaration file content or url

openapi: 3.0.0
info:
  title: uniqueItems test spec
  version: 1.0.0
  description: >-
    Spec used to test arrays with uniqueItems across every OpenAPI location
    and item type (string, integer, number, boolean, object, array, $ref).
paths:
  /unique-primitive-response-body:
    get:
      operationId: uniquePrimitiveResponseBody
      responses:
        '200':
          $ref: '#/components/responses/UniquePrimitiveArrayResponse'
components:
  schemas:
    UniqueStringArray:
      type: array
      uniqueItems: true
      items:
        type: string
  responses:
    UniquePrimitiveArrayResponse:
      description: Response body that is a primitive array with uniqueItems
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/UniqueStringArray'
        application/xml:
          schema:
            $ref: '#/components/schemas/UniqueStringArray'

Generation Details

Default generation, without Set to Array type mapping.

Steps to reproduce

Generate typescript-fetch client for the provided example.

Related issues/PRs

N/A

Suggest a fix

I will fix it myself.

The reproduction uses the typescript-fetch generator and test-set-response.ts in the set-type-mappings sample. Start by generating the client from the supplied OpenAPI spec and tracing the response conversion; done means the primitive unique-items response is a Set and result.has(...) works without changing the Set-to-Array mapping.