Consider making cilium config set modify Helm values rather than just ConfigMap

[joestringer]

There are examples of reconfigurations of Cilium like in cilium/cilium#31240 where it is not sufficient to just do cilium config set ... because this currently only changes the ConfigMap, it doesn't apply the full Helm changes (including changes to other resources).

One potential mitigation for this sort of issue would be for cilium config set ... to accept Helm configuration options and apply the full Helm change into the cluster rather than just the ConfigMap change.