Enhancement: disable DeepCopy when listing K8s resources from cache

### What would you like to be added?

Do not deep copy k8s resources, when listing them from cache.

### Why is this needed?

Deep copy is one of the key reasons lowering the controller performance. We need to avoid it.

The issue names no files, tests, or cache-listing entry point. Locate the cache-backed Kubernetes resource listing path, measure where deep copies occur, and determine how to avoid them while preserving resource behavior and safety; done means the listing no longer deep-copies resources and controller performance improves.

Written by the indexing model from the issue text.