Remove etcd dependency from example-apiserver

[drewwells]

apiserver builder has had several API contract changes and now has support for file storage backends. Convert the example apiserver to use one of these and remove references to etcd, remove etcd pod.

https://github.com/infobloxopen/konk/blob/main/helm-charts/example-apiserver/templates/deployment.yaml#L99

non-etcd example
https://github.com/kubernetes-sigs/apiserver-builder-alpha/blob/master/example/non-etcd/cmd/apiserver/main.go#L30