[v0.15] Validate kubeConfig Namespaces against known Fleet namespaces#5243
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Restrict kubeconfig secret reads to Fleet-managed namespaces and preserve same-namespace behavior for explicit or empty values. Keep legacy namespace entries for now because migration code paths still reference LegacyDefaultNamespace, and Rancher manager-initiated registration sets kubeConfigSecretNamespace to the cluster namespace.
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weyfonk
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Jun 5, 2026
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Validates kubeConfig secret namespaces so only allowed Fleet-managed namespaces are accepted.
Adds kubeconfig secret indexer and secret-watcher handling to detect config changes and trigger cluster reimports.
Backports #5224