Istio Module on Kyma

The concept name was not provided (marked as "undefined"), and the supplied source snippets do not contain enough shared, focused content to define a single, specific SAP developer concept. The sources touch on distinct topics — reverting Istio module deletion, managing network policies, and exposing workloads via Gateway API in SAP BTP, Kyma Runtime — without a clear unifying concept to define. A valid concept name is required to produce an accurate, grounded definition.