deployment instead of daemonset?

[dcherman]

the usage of a daemonset is no longer strictly necessary. originally, the daemonset was used in order to add labels to individual pods for use with podAffinity in order to have argo target nodes that already had the images pre-pulled, however that's actually already a factor in the kubernetes scheduler algo

we can swap to using a deployment instead and reduce the number of controller pods that we need down to 1, although we would need to add privileges to get/list/watch nodes, and we lose the ability to target specific nodes for image pre-pulling which could be implemented taints/tolerations/nodeSelector on the daemonset right now.