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
kubeflow/trainer#1581
kubeflow/katib#1758
kubeflow/trainer#1582

/cc @kimwnasptd

[johnugeorge]

/cc @surajkota

[kimwnasptd]

We will also need this for manifests, to run some basic e2e tests kubeflow/manifests#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.