Migrated Lateral Movement alert from interface to flow (Fixes #5485)

scripts/lua/modules/alert_keys/flow_alert_keys.lua

@@ -63,6 +63,7 @@ local flow_alert_keys = {
    flow_alert_iec_unexpected_type_id          = 55,
    flow_alert_tcp_no_data_exchanged           = 56,
    flow_alert_remote_access                   = 57,
+   flow_alert_lateral_movement                = 58,
    -- NOTE: for flow alerts not not go beyond the size of Bitmap alert_map inside Flow.h (currently 128)
 }