MNHA: Selective session synchronization

Use selective session synchronization for Multinode High Availability (MNHA) during cold and hot synchronization to optimize performance, reduce redundant state replication, and maintain fine-grained control over synchronization durations. Disable synchronization for short‑lived traffic or defer synchronization with a minimum age. You can configure selective session synchronization using default or user-defined flow profiles. You can disable session synchronization for short-lived sessions by setting session-sync disabled or delay synchronization based on session age by adjusting session-sync-min-age.