[BUG][KOTLIN-SPRING] Required properties are always listed first

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

With the generator kotlin-spring required properties of a model are always listed first, regardless of the configuration using sortModelPropertiesByRequiredFlag and sortParamsByRequiredFlag. The expected output is, that the order defined in the OpenAPI file is used for constructor parameters, when both of these properties are set to false.

openapi-generator version

6.5.0, also tested with latest docker image

OpenAPI declaration file content or url

openapi.yaml:

openapi: 3.0.1
info:
  title: OpenAPI example
  version: 0.0.1

paths: { }

components:
  schemas:
    TestObject:
      type: object
      required:
        - fieldA
        - fieldC
      properties:
        fieldA:
          type: string
          nullable: false
        fieldB:
          type: string
          nullable: true
        fieldC:
          type: string
          nullable: false

config.json:

{
  "sortModelPropertiesByRequiredFlag": false,
  "sortParamsByRequiredFlag": false
}

Generation Details

docker run --rm -v "${PWD}:/local" openapitools/openapi-generator-cli generate -g kotlin-spring -i /local/openapi.yaml -c /local/config.json -o /local/out

Expected output

data class TestObject(

    @Schema(example = "null", required = true, description = "")
    @get:JsonProperty("fieldA", required = true) val fieldA: kotlin.String,
    
    @Schema(example = "null", description = "")
    @get:JsonProperty("fieldB") val fieldB: kotlin.String? = null,

    @Schema(example = "null", required = true, description = "")
    @get:JsonProperty("fieldC", required = true) val fieldC: kotlin.String
) {

}

Actual output

data class TestObject(

    @Schema(example = "null", required = true, description = "")
    @get:JsonProperty("fieldA", required = true) val fieldA: kotlin.String,

    @Schema(example = "null", required = true, description = "")
    @get:JsonProperty("fieldC", required = true) val fieldC: kotlin.String,
    
    @Schema(example = "null", description = "")
    @get:JsonProperty("fieldB") val fieldB: kotlin.String? = null
) {

}

Steps to reproduce

Listed above.

Related issues/PRs

None found.

Reproduce the issue with the provided openapi.yaml and config.json using the kotlin-spring generator and the documented Docker command. Compare the generated TestObject constructor with the expected output. Done means both sortModelPropertiesByRequiredFlag and sortParamsByRequiredFlag set to false preserve the OpenAPI property order.