Align k8s version across ci distributions

[noahpb]

We are implementing nightly tests of uds-core against multiple k8s distributions. Currently, the IaC for these environments are managed independently with different tools (tofu, eksctl, uds-k3d). Since we manually declare the k8s version for each distribution in its IaC, it's difficult to determine which version we're using across the different distros in CI without digging into logs or pipeline code.

We should ensure that we are using the same k8s version across distributions. A system for tracking and updating these versions should be documented and/or automated. When looking at a pipeline run, it should be easy to tell what version and k8s distribution was used.

Solution

Open to ideas here - at a minimum we should have documentation for where the k8s version is declared for each distro and document the process for updating. As part of #777, we can display what version was used in the dashboard.

Additional context

We should also determine when a version update is required.