use peer.Status.LastSeen field to detect stale peer.Status.Connected values

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

management/server/store/sql_store.go

@@ -1962,6 +1962,9 @@ func (s *SqlStore) getPeers(ctx context.Context, accountID string) ([]nbpeer.Pee
 			}
 			if peerStatusConnected.Valid {
 				p.Status.Connected = peerStatusConnected.Bool
+				if peerStatusLastSeen.Valid {
+					p.Status.Connected = p.Status.Connected && peerStatusLastSeen.Time.Before(time.Now().Add(-5*time.Minute))
+				}
 			}
 			if peerStatusLoginExpired.Valid {
 				p.Status.LoginExpired = peerStatusLoginExpired.Bool