[BUG][Go] Invalid code generated for default values of array parameters

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

Given a parameter of type array with a default value defined, the Go generator produces invalid code:

else {
    var defaultValue []string = [port, virtual_network]
    r.include = &defaultValue
}

A valid form of the above code would look like this:

else {
    var defaultValue []string = []string{"port", "virtual_network"}
    r.include = &defaultValue
}

openapi-generator version

v7.8.0, but this issue was introduced by https://github.com/OpenAPITools/openapi-generator/pull/15127 and has existed since roughly v7.0.1.

OpenAPI declaration file content or url

  - in: query
    name: include
    schema:
      default:
      - port
      - virtual_network
      items:
        type: string
      type: array
    style: form

Generation Details

Steps to reproduce

Related issues/PRs

Suggest a fix

Start with the Go generator and the supplied OpenAPI YAML parameter definition, then reproduce generation using the reported v7.8.0 behavior. Trace how array default values become Go declarations. Done means the generated default uses valid Go slice syntax with the string values preserved, with regression coverage for this specification.