multi: context.Background() -> t.Context()

Use the new feature of Go 1.24, fix linter warnings.

This change was produced by:
 - running golangci-lint run --fix
 - sed 's/context.Background/t.Context/' -i `git grep -l context.Background | grep test.go`
 - manually fixing broken tests
 - itest, lntest: use ht.Context() where ht or hn is available
 - in HarnessNode.Stop() we keep using context.Background(), because it is
   called from a cleanup handler in which t.Context() is canceled already.

autopilot/betweenness_centrality_test.go

@@ -1,7 +1,6 @@
 package autopilot
 
 import (
-	"context"
 	"fmt"
 	"testing"
 
@@ -32,7 +31,7 @@ func TestBetweennessCentralityMetricConstruction(t *testing.T) {
 // Tests that empty graph results in empty centrality result.
 func TestBetweennessCentralityEmptyGraph(t *testing.T) {
 	t.Parallel()
-	ctx := context.Background()
+	ctx := t.Context()
 
 	centralityMetric, err := NewBetweennessCentralityMetric(1)
 	require.NoError(
@@ -64,7 +63,7 @@ func TestBetweennessCentralityEmptyGraph(t *testing.T) {
 // Test betweenness centrality calculating using an example graph.
 func TestBetweennessCentralityWithNonEmptyGraph(t *testing.T) {
 	t.Parallel()
-	ctx := context.Background()
+	ctx := t.Context()
 
 	workers := []int{1, 3, 9, 100}
 

autopilot/externalscoreattach_test.go

@@ -1,7 +1,6 @@
 package autopilot_test
 
 import (
-	"context"
 	"testing"
 
 	"github.com/btcsuite/btcd/btcec/v2"
@@ -23,7 +22,7 @@ func randKey() (*btcec.PublicKey, error) {
 // ExternalScoreAttachment correctly reflects the scores we set last.
 func TestSetNodeScores(t *testing.T) {
 	t.Parallel()
-	ctx := context.Background()
+	ctx := t.Context()
 
 	const name = "externalscore"
 

autopilot/prefattach_test.go

@@ -76,7 +76,7 @@ var chanGraphs = []struct {
 // empty graph, the NodeSores function always returns a score of 0.
 func TestPrefAttachmentSelectEmptyGraph(t *testing.T) {
 	t.Parallel()
-	ctx := context.Background()
+	ctx := t.Context()
 	prefAttach := NewPrefAttachment()
 
 	// Create a random public key, which we will query to get a score for.
@@ -116,7 +116,7 @@ func TestPrefAttachmentSelectEmptyGraph(t *testing.T) {
 // and the funds are appropriately allocated across each peer.
 func TestPrefAttachmentSelectTwoVertexes(t *testing.T) {
 	t.Parallel()
-	ctx := context.Background()
+	ctx := t.Context()
 
 	prand.Seed(time.Now().Unix())
 
@@ -203,7 +203,7 @@ func TestPrefAttachmentSelectTwoVertexes(t *testing.T) {
 // allocate all funds to each vertex (up to the max channel size).
 func TestPrefAttachmentSelectGreedyAllocation(t *testing.T) {
 	t.Parallel()
-	ctx := context.Background()
+	ctx := t.Context()
 
 	prand.Seed(time.Now().Unix())
 
@@ -316,7 +316,7 @@ func TestPrefAttachmentSelectGreedyAllocation(t *testing.T) {
 // of zero during scoring.
 func TestPrefAttachmentSelectSkipNodes(t *testing.T) {
 	t.Parallel()
-	ctx := context.Background()
+	ctx := t.Context()
 
 	prand.Seed(time.Now().Unix())
 

autopilot/top_centrality_test.go

@@ -1,7 +1,6 @@
 package autopilot
 
 import (
-	"context"
 	"testing"
 
 	"github.com/btcsuite/btcd/btcec/v2"
@@ -59,7 +58,7 @@ func testTopCentrality(t *testing.T, graph testGraph,
 		// Attempt to get centrality scores and expect
 		// that the result equals with the expected set.
 		scores, err := topCentrality.NodeScores(
-			context.Background(), graph, channels, chanSize, nodes,
+			t.Context(), graph, channels, chanSize, nodes,
 		)
 
 		require.NoError(t, err)