Add kubetest2 support

[upodroid]

Merging kubernetes-sigs/kubetest2#230 will allow us to use kubetest2 for both EC2 and GCE node e2e tests with simplified prowjob generator logic.

/cc @dims

[k8s-ci-robot]

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[k8s-ci-robot]

@upodroid: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kubernetes-node-e2e-containerd-serial-ec2-canary	2da9e6d	link	true	/test pull-kubernetes-node-e2e-containerd-serial-ec2-canary

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