refactor: replace context.Background() with t.Context()/b.Context() in tests (#7352)

Based on the Go version we currently use, the dependency already
supports 1.24+, which allows using `t.Context()` and `b.Context()` in
unit tests and benchmarks respectively.

- Enable `context-background` and `context-todo` in
[`usetesting`](https://golangci-lint.run/docs/linters/configuration/#usetesting)
- Adjust the code to support linter detection

---------

Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>
Co-authored-by: Tyler Yahn <codingalias@gmail.com>
Co-authored-by: Damien Mathieu <42@dmathieu.com>

log/internal/global/log_test.go

@@ -41,7 +41,7 @@ func TestLoggerProviderConcurrentSafe(*testing.T) {
 	<-done
 }
 
-func TestLoggerConcurrentSafe(*testing.T) {
+func TestLoggerConcurrentSafe(t *testing.T) {
 	l := &logger{}
 
 	done := make(chan struct{})
@@ -50,7 +50,7 @@ func TestLoggerConcurrentSafe(*testing.T) {
 	go func() {
 		defer close(done)
 
-		ctx := context.Background()
+		ctx := t.Context()
 		var r log.Record
 		var param log.EnabledParameters
 

log/logtest/assert_test.go

@@ -4,7 +4,6 @@
 package logtest
 
 import (
-	"context"
 	"fmt"
 	"testing"
 	"time"
@@ -63,7 +62,7 @@ func TestAssertEqualRecording(t *testing.T) {
 				Scope{Name: t.Name()}: []Record{
 					{
 						Timestamp:  y2k,
-						Context:    context.Background(),
+						Context:    t.Context(),
 						Attributes: []log.KeyValue{log.Int("n", 1), log.String("foo", "bar")},
 					},
 				},
@@ -72,7 +71,7 @@ func TestAssertEqualRecording(t *testing.T) {
 				Scope{Name: t.Name()}: []Record{
 					{
 						Timestamp:  y2k,
-						Context:    context.Background(),
+						Context:    t.Context(),
 						Attributes: []log.KeyValue{log.String("foo", "bar"), log.Int("n", 1)},
 					},
 				},
@@ -145,12 +144,12 @@ func TestAssertEqualRecord(t *testing.T) {
 			name: "equal records",
 			a: Record{
 				Timestamp:  y2k,
-				Context:    context.Background(),
+				Context:    t.Context(),
 				Attributes: []log.KeyValue{log.Int("n", 1), log.String("foo", "bar")},
 			},
 			b: Record{
 				Timestamp:  y2k,
-				Context:    context.Background(),
+				Context:    t.Context(),
 				Attributes: []log.KeyValue{log.String("foo", "bar"), log.Int("n", 1)},
 			},
 			want: true,

log/logtest/example_test.go

@@ -4,7 +4,6 @@
 package logtest_test
 
 import (
-	"context"
 	"testing"
 	"time"
 
@@ -26,7 +25,7 @@ func Example() {
 	r.SetBody(log.StringValue("Hello there"))
 	r.AddAttributes(log.String("foo", "bar"))
 	r.AddAttributes(log.Int("n", 1))
-	l.Emit(context.Background(), r)
+	l.Emit(t.Context(), r)
 
 	// Verify that the expected and actual log records match.
 	want := logtest.Recording{

log/logtest/recorder_test.go

@@ -73,7 +73,7 @@ func TestLoggerEnabled(t *testing.T) {
 	}{
 		{
 			name: "the default option enables every log entry",
-			ctx:  context.Background(),
+			ctx:  t.Context(),
 			want: true,
 		},
 		{
@@ -83,7 +83,7 @@ func TestLoggerEnabled(t *testing.T) {
 					return false
 				}),
 			},
-			ctx:  context.Background(),
+			ctx:  t.Context(),
 			want: false,
 		},
 	} {
@@ -96,7 +96,7 @@ func TestLoggerEnabled(t *testing.T) {
 
 func TestLoggerEnabledFnUnset(t *testing.T) {
 	r := &logger{}
-	assert.True(t, r.Enabled(context.Background(), log.EnabledParameters{}))
+	assert.True(t, r.Enabled(t.Context(), log.EnabledParameters{}))
 }
 
 func TestRecorderLoggerEmitAndReset(t *testing.T) {
@@ -104,7 +104,7 @@ func TestRecorderLoggerEmitAndReset(t *testing.T) {
 	ts := time.Now()
 
 	l := rec.Logger(t.Name())
-	ctx := context.Background()
+	ctx := t.Context()
 	r := log.Record{}
 	r.SetTimestamp(ts)
 	r.SetSeverity(log.SeverityInfo)
@@ -149,7 +149,7 @@ func TestRecorderLoggerEmitAndReset(t *testing.T) {
 	assert.Equal(t, want, got)
 }
 
-func TestRecorderConcurrentSafe(*testing.T) {
+func TestRecorderConcurrentSafe(t *testing.T) {
 	const goRoutineN = 10
 
 	var wg sync.WaitGroup
@@ -162,8 +162,8 @@ func TestRecorderConcurrentSafe(*testing.T) {
 			defer wg.Done()
 
 			nr := r.Logger("test")
-			nr.Enabled(context.Background(), log.EnabledParameters{})
-			nr.Emit(context.Background(), log.Record{})
+			nr.Enabled(t.Context(), log.EnabledParameters{})
+			nr.Emit(t.Context(), log.Record{})
 
 			r.Result()
 			r.Reset()

log/noop/noop_test.go

@@ -4,7 +4,6 @@
 package noop // import "go.opentelemetry.io/otel/log/noop"
 
 import (
-	"context"
 	"reflect"
 	"testing"
 
@@ -44,7 +43,7 @@ func assertAllExportedMethodNoPanic(rVal reflect.Value, rType reflect.Type) func
 				numIn--
 			}
 			args := make([]reflect.Value, numIn)
-			ctx := context.Background()
+			ctx := t.Context()
 			for i := range args {
 				aType := mType.Type.In(i)
 				if aType.Name() == "Context" {