Marrying User Metadata Into Cluster

[rwitten]

https://kubernetes.io/docs/concepts/configuration/configmap/

(1) Should workload create need the accelerator type? Can we extract it from the XPK cluster? (2) Where else can we simplify? For example, I feel like we should validate the "additional flags" don't change? Right now it is easy to pass in new flags and then act surprised when they don't go into effect.