[BUG][KOTLIN] Prefix "TYPE" is being removed from enum values after model generation

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

I have an enum with values "TYPE_INVALID" and "TYPE_VALID" in my swagger.
After generating the model, openapi is defining the enum values as "INVALID" and "VALID".

How can I avoid this behaviour and keep the values with their original names?

openapi-generator version

5.0.0

OpenAPI declaration file content or url

SWAGGER

        slotValidationForCheckout:
          type: string
          enum:
            - TYPE_VALID
            - TYPE_INVALID

Generated code

    enum class SlotValidationForCheckout(val value: kotlin.String){
        @JsonProperty(value = "TYPE_VALID") VALID("TYPE_VALID"),
        @JsonProperty(value = "TYPE_INVALID") INVALID("TYPE_INVALID");
    }

Start by reproducing the report with the supplied Swagger YAML and Kotlin model generation, then trace the enum-name handling that turns TYPE_VALID and TYPE_INVALID into VALID and INVALID. The work is done when generated Kotlin enum constants retain the original TYPE_ names while their serialized values remain correct; no specific source file or test is named in the issue.