Add support for jwt validation action at the ingress level

[sarevalo2002]

Motivation

This PR adds AWS Load Balancer Controller support for the JWT validation action at the ingress level.

See documentation: https://docs.aws.amazon.com/elasticloadbalancing/latest/application/listener-verify-jwt.html
See launch announcement: https://aws.amazon.com/about-aws/whats-new/2025/11/application-load-balancer-jwt-verification/

Description

This implementation was implemented in a similar style as the existing authentication action (another pre-routing action type that is currently implemented at the ingress level):

• Added alb.ingress.kubernetes.io/jwt-validation annotation to support JWT validation
• Added buildSDKJwtValidationConfig to transform ingress model config to SDK config
• Added buildJwtValidationAction to transform enhanced backend model to ingress model config
• Added buildJwtValidationConfig to parse annotation into enhanced backend model
  • This includes some very minor client-side validation for known required values for faster feedback
• Updated ingress e2e test with JWT validation case
• Updated documentation with JWT validation usage and example

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: sarevalo2002
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[k8s-ci-robot]

Hi @sarevalo2002. Thanks for your PR.

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[zac-nixon]

/ok-to-test