The "Remove legacy namespace" task unconditionally ran
kubectl delete namespace on every playbook run carrying the upgrade
tag, wiping user-managed resources in the cert-manager namespace (for
example custom Issuer secrets) as well as cert-manager's own state,
before the namespace was recreated and the manifests re-applied.
The legacy addon migration this cleanup was written for dates back to
2018 and no longer applies; the apply path (kube module, state latest)
upgrades cert-manager in place without a namespace reset.
Signed-off-by: longyuxiang <longyuxiang@kylinos.cn>
longxiucai