bpf: overlay: fix missing DBG_DECAP for Inter-Cluster-SNAT #28466
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For Inter-Cluster-SNAT traffic we tail-call in handle_ipv4() before even reaching the DBG_DECAP message.
Pull up the cilium_dbg() call a bit so that it also applies to inter-cluster-SNAT traffic. While at it also clarify which parameters are relevant for the path that handles decrypted packets.