[BUG] Kotlin-server generates singular type instead of list for responses of type array

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

In kotlin-server generator (library jaxrs-spec, interfaceOnly=true) generated code for array response uses only singular type, not the expected List.

Expected result (generated with 7.2.0):

package org.openapitools.server.apis;


import javax.ws.rs.*
import javax.ws.rs.core.Response


import java.io.InputStream



@Path("/")
@javax.annotation.Generated(value = arrayOf("org.openapitools.codegen.languages.KotlinServerCodegen"))
interface DefaultApi {

    @POST
    @Path("/example")
    @Consumes("application/json")
    @Produces("application/json")
    fun shouldReturnArray( body: kotlin.String): kotlin.collections.List<kotlin.String>
}

Actual result (generated with 7.3.0, 7.4.0-SNAPSHOT):

package org.openapitools.server.apis;


import javax.ws.rs.*
import javax.ws.rs.core.Response


import java.io.InputStream



@Path("/")
@javax.annotation.Generated(value = arrayOf("org.openapitools.codegen.languages.KotlinServerCodegen"))
interface DefaultApi {

    @POST
    @Path("/example")
    @Consumes("application/json")
    @Produces("application/json")
    fun shouldReturnArray( body: kotlin.String): kotlin.String
}

openapi-generator version

7.3.0

OpenAPI declaration file content or url

openapi: 3.0.0
info:
  description: test
  version: 0.0.1
  title: test

paths:
  /example:
    post:
      summary: Example endpoint
      operationId: should-return-array
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: string
      responses:
        200:
          description: successful operation
          content:
            application/json:
              schema:
                type: array
                items:
                  type: string

Generation Details

openapi-generator-cli generate -i test.openapi.yaml -g kotlin-server --library jaxrs-spec -o /tmp/openapi-test -p interfaceOnly=true

Steps to reproduce

Issue can be reproduced with above openapi specification and CLI command.

Related issues/PRs

Suggest a fix

Start with the openapi-generator-cli generate command using -g kotlin-server, --library jaxrs-spec, and interfaceOnly=true, along with the YAML specification in the report. Reproduce the generated DefaultApi response and trace the Kotlin server generation path; done means an array response produces kotlin.collections.List<kotlin.String> rather than kotlin.String.