Explore increasing instance sizes for Kubernetes

Problem Statement

Currently we are exploring options for increasing the length of time for which we have available IP addresses for our zonal clusters. One of the mentioned short term solutions is to simply replace our existing node pools with larger instance sizes which should reduce the count of overall nodes as a whole.

Utilize this issue to determine the best instance sizes for all node pools and begin a migration plan to do such.

Refer to &571 (closed) for details on where we are with saturation.

Note that the effort in this issue is segregated from &527 (closed)