autopilot: update AttachmentHeuristics with context

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

autopilot/externalscoreattach_test.go

@@ -1,6 +1,7 @@
 package autopilot_test
 
 import (
+	"context"
 	"testing"
 
 	"github.com/btcsuite/btcd/btcec/v2"
@@ -22,6 +23,7 @@ func randKey() (*btcec.PublicKey, error) {
 // ExternalScoreAttachment correctly reflects the scores we set last.
 func TestSetNodeScores(t *testing.T) {
 	t.Parallel()
+	ctx := context.Background()
 
 	const name = "externalscore"
 
@@ -62,7 +64,7 @@ func TestSetNodeScores(t *testing.T) {
 		q[nID] = struct{}{}
 	}
 	resp, err := h.NodeScores(
-		nil, nil, btcutil.Amount(btcutil.SatoshiPerBitcoin), q,
+		ctx, nil, nil, btcutil.Amount(btcutil.SatoshiPerBitcoin), q,
 	)
 	if err != nil {
 		t.Fatal(err)