Support AWS EKS cluster version 1.22 in CI

[johnugeorge]

Inorder to support CI tests on k8s 1.22, testing worker images needs to upgraded to support k8s 1.22 cluster creation.

Related:

#971 https://github.com/kubeflow/training-operator/issues/1581 https://github.com/kubeflow/katib/pull/1758 https://github.com/kubeflow/training-operator/pull/1582

/cc @kimwnasptd

[johnugeorge]

/cc @surajkota

[kimwnasptd]

We will also need this for manifests, to run some basic e2e tests https://github.com/kubeflow/manifests/issues/2099

I'll try to take a stab at this to see what are the minimum changes to do for updating eksctl and building a new worker image to use it.