[BUG] Kotlin server does not escape special character ('$') in jackson annotation

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

The given schema component with a special character in a property name.

(Example: "Group" schema from SCIM)

Using the kotlin server generator with jackson serializer generates invalid code

data class BaseGroupMembersInner (

    /* The `id` of the member.  Each value MUST be the `id` of the corresponding `User` resource, which is unique across the service provider's entire set of resources.  */

    @JsonProperty("value")
    val `value`: java.util.UUID,

    /* The URI of the corresponding `User` resource.  Nullable for requests but required for responses.  */

    @JsonProperty("$ref")
    val dollarRef: kotlin.String? = null

)

It should escape the special character ($)

@JsonProperty("\$ref")

openapi-generator version

7.11.0

OpenAPI declaration file content or url

openapi: 3.1.0

info:
  version: 5.0.5
  title: Internal Users SCIM
  description: ...
tags:
  - name: Groups
    description: ...

paths:
  /v3/internal/scim/Groups/{id}:
    get:
      summary: 'Get group by id'
      description: ...
      externalDocs:
        url: 'https://datatracker.ietf.org/doc/html/rfc7644#section-3.2'
        description: 'RFC 7644, Section 3.2'
      operationId: getGroup
      tags:
        - Groups
      parameters:
        - $ref: '#/components/parameters/GroupIdInPath'
      responses:
        '200':
          description: Successful response
          content:
            application/scim+json:
              schema:
                $ref: '#/components/schemas/Group'
            application/json:
              schema:
                $ref: '#/components/schemas/Group'

components:
  parameters:
    GroupIdInPath:
      name: id
      in: path
      description: |
        The unique identifier of a group
      required: true
      schema:
        type: string
        format: uuid
  schemas:
    Meta:
      type: object
      description: ...
      externalDocs:
        url: 'https://datatracker.ietf.org/doc/html/rfc7643#section-3.1'
        description: 'RFC 7643, Section 3.1'
      properties:
        resourceType:
          type: string
          description: ...
          examples:
            - 'ResourceType'
        created:
          type: string
          format: date-time
          description: ...
          examples:
            - '2024-07-21T17:32:28Z'
        lastModified:
          type: string
          format: date-time
          description: ...
        location:
          type: string
          description: ...
        version:
          type: string
          description: ...
    BaseGroup:
      type: object
      description: ...
      externalDocs:
        url: 'https://datatracker.ietf.org/doc/html/rfc7643#section-4'
        description: 'RFC 7643, Section 4'
      required:
        - members
      properties:
        members:
          type: array
          description: ...
          items:
            type: object
            required:
              - value
            properties:
              value:
                type: string
                format: uuid
                description: ...
              $ref:
                type:
                  - "string"
                  - "null"
                description: ...
          default: [ ] # default is for `PUT` request
    Group:
      type: object
      description: ...
      externalDocs:
        url: 'https://datatracker.ietf.org/doc/html/rfc7643#section-4'
        description: 'RFC 7643, Section 4'
      required:
        - schemas
        - id
        - displayName
        - members
      allOf:
        - type: object
          properties:
            schemas:
              type: array
              description: ...
              items:
                type: string
            id:
              type: string
              format: uuid
              readOnly: true
              description: ...
            displayName:
              type: string
              readOnly: true
              description: ...
        - $ref: '#/components/schemas/BaseGroup'

Generation Details

Gradle configuration

openApiGenerate {
    generatorName = "kotlin-server"
    inputSpec = "${rootProject.projectDir}/rest-application/src/main/resources/test-petstore-api.yml"
    library.convention("jaxrs-spec")
    outputDir.convention("${project.layout.buildDirectory.get()}/generated-rest/server/scim")
    apiPackage.convention("com.toasttab.service.scim.api")
    modelPackage.convention("com.toasttab.service.scim.models")
    packageName.convention("com.toasttab.service.scim")
    additionalProperties.convention(
        mapOf(
            "collectionType" to "list",
            "enumPropertyNaming" to "UPPERCASE",
            "dateLibrary" to "java8",
            "interfaceOnly" to "true",
            "returnResponse" to "true"
        )
    )
}

Steps to reproduce

1. Define a schema wit a property name of $ref
2. Configure opernapi generator with generatorName = "kotlin-server" AND library.convention("jaxrs-spec")
3. Attempt to generate server side code

Related issues/PRs

Suggest a fix

Start with the kotlin-server generator entry point using the jaxrs-spec library and reproduce the issue with the provided schema and Gradle configuration. Compare the generated BaseGroupMembersInner output with the expected escaped @JsonProperty("$ref") form. Done means the generated Kotlin source is valid and preserves the $ref property name.