[#9999] engine: Add non-blocking send in the shard's notification channel

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/local_object_storage/engine/shards.go

@@ -328,6 +328,7 @@ func (e *StorageEngine) HandleNewEpoch(ctx context.Context, epoch uint64) {
 		case <-ctx.Done():
 			return
 		case sh.NotificationChannel() <- ev:
+		default:
 		}
 	}
 }