Emit ContainerImage entity and RelatesTo relationship events from k8seventgenerationprocessor

[gantrior]

Summary

The k8seventgenerationprocessor should emit ContainerImage entity state events and RelatesTo relationship state events connecting ContainerImage to KubernetesContainerImage when processing pod manifests.

Background

The processor already emits KubernetesContainerImage and KubernetesResourceUsesImage events. Entity schemas for ContainerImage and the RelatesTo relationship connecting it to KubernetesContainerImage are defined in entity-service-schemas but the collector never emits these events.

Changes Required

• Add transformContainersToCICDContainerImageLogs function to emit ContainerImage entities deduplicated by oci.manifest.digest per pod manifest
• Add transformContainersToCICDContainerImageRelatesToLogs function to emit RelatesTo relationships with ContainerImage source and KubernetesContainerImage destination
• Wire both functions into PodManifest case in processor.go
• Process main + init containers, skip ephemeral containers
• Best-effort error handling: skip malformed/empty ImageIDs with warnings