Remove optional types from ssl_groups validation rule since they are …

[dsessler7]

…not supported in k8s versions earlier than 1.29

Checklist:

• [ ] Have you added an explanation of what your changes do and why you'd like them to be included?
• [ ] Have you updated or added documentation for the change, as applicable?
• [ ] Have you tested your changes on all related environments with successful results, as applicable?
  • [ ] Have you added automated tests?

Type of Changes:

• [ ] New feature
• [x] Bug fix
• [ ] Documentation
• [ ] Testing enhancement
• [ ] Other

What is the current behavior (link to any open issues here)?

There is a validation rule that uses CEL optional types which is only supported in k8s 1.29 and later. We support earlier k8s versions (via OpenShift support) for 5.8, so users running these earlier versions are unable to upgrade to 5.8.5.

What is the new behavior (if this is a feature change)?

• [ ] Breaking change (fix or feature that would cause existing functionality to change)

The rule has been changed to not use optional types.

Other Information: