Cache: Support multiple namespaces for just one type

[alvaroaleman]

Today, the cache supports multiple namespaces but they then get set for all namespaced objects. It is not possible to have a per-object multi-namespace config.

[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues.

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• After 90d of inactivity, lifecycle/stale is applied
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/lifecycle stale

[vincepri]

/lifecycle frozen