[BUG][KOTLIN] Generated enum class name contains "`" instead of backticks when named using reserved kotlin words

Description

Generator: "kotlin-spring".
Generated enum class name contains "`" instead of backtick "`" for enums named using reserved kotlin words.

openapi-generator version

5.2.1, 5.3.0, 5.4.0

OpenAPI declaration file content or url

openapi: 3.0.3
info:
  title: Kotlin Issue
  version: "1.0"
paths:
  /issue:
    get:
      tags:
      - Issue
      responses:
        '200':
          description: Computer
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Computer'
components:
  schemas:
    Computer:
      type: object
      properties:
        interface:
          type: string
          description: Computer interface
          example: USB
          enum:
          - USB
          - HDMI

Generation Details

gradle plugin configured as follows (simplified):

tasks.register<GenerateTask>("generateApi") {
    configOptions.put("dateLibrary", "java8")
    configOptions.put("serializationLibrary", "jackson")
    configOptions.put("gradleBuildFile", "false")
    configOptions.put("enumPropertyNaming", "original")
    configOptions.put("interfaceOnly", "true")
    configOptions.put("exceptionHandler", "false")
    configOptions.put("useTags", "true")
}

Steps to reproduce

Generate code and open Computer.kt. Simplified content:

data class Computer(
  @field:JsonProperty("interface") val `interface`: Computer.`Interface`,
) {
  enum class `Interface`(val value: kotlin.String) {
  
    @JsonProperty("USB") USB("USB"),  
    @JsonProperty("HDMI") HDMI("HDMI");  
  }
}

Related issues/PRs

https://github.com/OpenAPITools/openapi-generator/issues/11148
https://github.com/OpenAPITools/openapi-generator/issues/11304

Suggest a fix

Reproduce the kotlin-spring generation from the OpenAPI declaration in the issue and inspect the generated Computer.kt output. Trace how the reserved property name interface leads to the nested enum name, then verify that the generated enum class uses Kotlin backticks rather than the literal ` text.