Reduce number of nodes in manyaddons tests #16934
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Many of the manyaddons tests are flaky:
https://testgrid.k8s.io/kops-upgrades-many-addons
Mid rotation some nodes fail to join for some reason:
I'll revisit #16354 to improve our visibility here, but first we can try reducing the number of nodes. The not-manyaddons upgrade tests use 4 nodes total, and most of the extra Deployments in the cluster have very minimal resource requests, so we'll try reducing from 12 to 6 nodes total.