Bug: Kyverno CEL library functions fail in policy matchConditions

Bug: Kyverno CEL library functions fail in policy matchConditions: a task in LegoFlow-SWE (Harbor dataset). Description When a MutatingPolicy or ValidatingPolicy uses matchConditions with CEL expressions that reference Kyverno‑specific functions (like image() , variables , or custom string…

The task

**Description** When a `MutatingPolicy` or `ValidatingPolicy` uses `matchConditions` with CEL expressions that reference Kyverno‑specific functions (like `image()`, `variables`, or custom string extensions), webhook configuration validation fails with errors such as:

Part of Lego-X/LegoFlow-SWE.