Use containerd for all our nodes
Use containerd for all our nodes

- Remove the word 'pool' from the user pool nodepool name. Just
  adds clutter, and cuts off the full date from node names as kubernetes
  objects have a 63 char max limit
- Use 1 rather than 2 as default node startup count.

I've manually created alpha, beta and delta pools to match what we
have. This also bumps the k8s version on them.

Ref https://github.com/berkeley-dsep-infra/datahub/issues/2958

berkeley-dsep-infra/datahub,berkeley-dsep-infra/datahub,berkeley-dsep-infra/datahub,ryanlovett/datahub,ryanlovett/datahub,ryanlovett/datahub