Matrix k8s version testing [latest, n-1] on k3d/eks

[MxNxPx]

Describe what should be investigated or refactored

EKS support for v1.27 will be EOL soon-ish

Links to any relevant code

Will want to bump k3d version, RKE2 version, and EKS version

Additional context

Considering there will be folks using UDS on older K8s versions than what is used to publish, ought to consider adding some testing of n-1 K8s version

[mjnagel]

Updating this ticket:

• we are 1.29.5 for k3d/k3s
• we are on 1.27 for EKS
• RKE2 infra is not maintained as a part of our repo/CI currently but we have other testing environments that we should update to 1.29+

[mjnagel]

Rescoping this effort to focus on testing across multiple k8s distros. To start we should do nightly test on the latest k8s minor version and n-1 minor version, at minimum on k3d - possibly on eks as well.

[MxNxPx]

Updating this ticket:

• we are 1.29.5 for k3d/k3s
• we are on 1.27 for EKS
• RKE2 infra is not maintained as a part of our repo/CI currently but we have other testing environments that we should update to 1.29+

Now on 1.30 for EKS per #605