generate single yaml file for spin-operator and add to release assets

[michelleN]

This yaml file would contain everything that folks get from the default helm install in the quickstart. Then, we can replace the helm install with a kubectl apply command, so folks don't have to use helm install during the quickstart if they don't want to.

[endocrimes]

kubectl kustomize would also work for this today - but I wouldn't be opposed to generating our default kustomize build in releases

[michelleN]

I don't remember the exact syntax but just to note, we'll need to pass in the target image tag while using kubectl kustomize.