MNHA support for Express Path

Express Path, formerly services offloading, in MNHA (SRG0 and SRG1+) reduces latency and ensures seamless packet forwarding post-failover. It creates stateful and static SOF sessions on the other node for immediate readiness, prevents premature session aging, preserves session integrity, and manages first packet processing during primary role transitions. The system also terminates and reinstalls SOF sessions in the newly failed node for accurate management. MNHA systems in Layer 3 (Routing) mode support this functionality.