The pod_logs subsystem was inadvertently made redundant in the following
kube-apiserver metrics:
- kube_apiserver_pod_logs_pods_logs_backend_tls_failure_total
- kube_apiserver_pod_logs_pods_logs_insecure_backend_total
To safely rename them, it is required to deprecate them in 1.27 whilst
introducing the new metrics replacing them.
Signed-off-by: Damien Grisonnet <dgrisonn@redhat.com>