[SURE-9138] rke2-control-plane-system: unable to lookup or create cluster certificates, external certificate not found: secrets "cluster-etcd" not found

[kkaempf]

SURE-9138

Issue description:

The customer is seeing the following error:

E0916 12:43:13.582966 1 workload_cluster.go:118] "Collecting etcd key pair from remote" controller="rke2controlplane" controllerGroup="controlplane.cluster.x-k8s.io" controllerKind="RKE2ControlPlane" RKE2ControlPlane="rke2test/rke2test-master" namespace="rke2test" name="rke2test-master" reconcileID="b94f1a99-df21-4d73-aaa5-cb7e1a69a1a3"
E0916 12:43:13.603661 1 management_cluster.go:171] "unable to lookup or create cluster certificates" err="external certificate not found: secrets \"cluster-etcd\" not found" controller="rke2controlplane" controllerGroup="controlplane.cluster.x-k8s.io" controllerKind="RKE2ControlPlane" RKE2ControlPlane="rke2test/rke2test-master" namespace="rke2test" name="rke2test-master" reconcileID="b94f1a99-df21-4d73-aaa5-cb7e1a69a1a3" 

We told them that this should be a transient error during the provisioning phase [1] but they are reporting that this issue not only during the provisioning phase, but also in stable clusters even weeks after the cluster was deployed.