Invalid `check` statement for string list field with regex

[milas]

Bug Report

List types with regex validation create nonsensical KCL that will attempt to run the regex against a stringified version of the collection instead of each individual element.

1. Minimal reproduce step (Required)

You can see this in the Karpenter types:

https://github.com/kcl-lang/modules/blob/7796cd48b4c2d0e33d288d7c84ae98e1788f294c/karpenter/v1/karpenter_sh_v1_node_pool.k#L337

There is a values?: [str] field, and the check is nonsensical:

_regex_match(str(values), r"^(([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9])?$") if values

2. What did you expect to see? (Required)

I would expect values: ["a", "b", "c"] to pass validation.

3. What did you see instead (Required)

It fails validation because str(values) turns into '[a, b, c]'.

Each value should be evaluated against the regex independently, not a stringified version of the list.

4. What is your KCL components version? (Required)

0.12.3