autopilot: update AttachmentHeuristics with context

Continue threading context through the autopilot system and remove the
remaining context.TODOs.

lnrpc/autopilotrpc/autopilot_server.go

@@ -236,7 +236,7 @@ func (s *Server) QueryScores(ctx context.Context, in *QueryScoresRequest) (
 
 	// Query the heuristics.
 	heuristicScores, err := s.manager.QueryHeuristics(
-		nodes, !in.IgnoreLocalState,
+		ctx, nodes, !in.IgnoreLocalState,
 	)
 	if err != nil {
 		return nil, err