labelsfilter: ignore Job completion index label by default for CID creation #28897
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This prevents creating a CiliumIdentity object per Pod that is owned by an Indexed Job. This was especially costly in clusters with large quantities of Indexed Job-controlled Pods and basically limited the number of such Pods in a single cluster to a theoretical max number of CID objects (2^16 ~ 65k).
This is a follow-up to #28003 after the relevant change in the upstream K8s 1.28+.