[v2.11] Remove support for K8s 1.28 and 1.29 for Rancher 2.11.0

[mjura]

Summary

Fixes #13233

Occurred changes and/or fixed issues

Remove k8s 1.28 and 1.29 from EKS version options

Areas or cases that should be tested

1. Create a new EKS cluster: k8s versions <1.30 should not be available.

Checklist

• The PR is linked to an issue and the linked issue has a Milestone, or no issue is needed
• The PR has a Milestone
• The PR template has been filled out
• The PR has been self reviewed
• The PR has a reviewer assigned
• The PR has automated tests or clear instructions for manual tests and the linked issue has appropriate QA labels, or tests are not needed
• The PR has reviewed with UX and tested in light and dark mode, or there are no UX changes

[nwmac]

@mjura Can you link the dashboard issue for this or create one and complete the PR template, so that the template check gate passes. Thank you.

[mantis-toboggan-md]

lgtm - updated to add a rancher/dashboard issue