[BUG] [Kotlin] [Spring] Components inheriting with `allOf` do not have default value set for array type

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?

Description

When inheriting another schema component which has a property of type array with a default value set, the default value is not inherited.

openapi-generator version

7.2.0

OpenAPI declaration file content or url

https://gist.github.com/ffffionn/355902ce0ab773f9101da1b4faf5c1a9

Generation Details

I'm using kotlin-spring generator via the maven-plugin.

Steps to reproduce

Generate the models and see the subRequest does not inherit the default value for the array type. (The string type inherits just fine)

Start with the linked OpenAPI declaration and reproduce the generated models using the kotlin-spring generator through the Maven plugin. Compare the inherited array and string properties in the generated output, then trace the Kotlin Spring model-generation path to locate where array defaults are handled. Done means the inherited array property retains its declared default value while existing string behavior remains unchanged.