Scale testing

**Describe the solution you'd like:**
It would be good to do some testing of creating microvms/clusters at scale. This could be a large number of clusters or a small number of clusters with a large number of nodes.

**Why do you want this feature:**
This is good information for customers, sales and our own learning as to where the bottlenecks are.

**Anything else you would like to add:**
[Miscellaneous information that will assist in solving the issue.]

No files, tests, or entry points are named. Start by clarifying the target cluster and node scales, then trace the repository's microVM and cluster creation paths to determine how scale and bottlenecks should be measured; done means repeatable scale tests with documented results.

Written by the indexing model from the issue text.