review feedback: add goleak verification to tests

internal/component/database_observability/mysql/collector/connection_info_test.go

@@ -9,9 +9,12 @@ import (
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/testutil"
 	"github.com/stretchr/testify/require"
+	"go.uber.org/goleak"
 )
 
 func TestConnectionInfoRun(t *testing.T) {
+	defer goleak.VerifyNone(t)
+
 	const baseExpectedMetrics = `
 	# HELP connection_info Information about the connection
 	# TYPE connection_info gauge

internal/component/database_observability/mysql/collector/query_sample_test.go

@@ -8,13 +8,16 @@ import (
 
 	loki_fake "github.com/grafana/alloy/internal/component/common/loki/client/fake"
 	"github.com/prometheus/common/model"
+	"go.uber.org/goleak"
 
 	"github.com/DATA-DOG/go-sqlmock"
 	"github.com/go-kit/log"
 	"github.com/stretchr/testify/require"
 )
 
 func TestQuerySampleRun(t *testing.T) {
+	defer goleak.VerifyNone(t)
+
 	db, mock, err := sqlmock.New(sqlmock.QueryMatcherOption(sqlmock.QueryMatcherEqual))
 	require.NoError(t, err)
 	defer db.Close()

internal/component/database_observability/mysql/collector/schema_table_test.go

@@ -11,9 +11,14 @@ import (
 	loki_fake "github.com/grafana/alloy/internal/component/common/loki/client/fake"
 	"github.com/prometheus/common/model"
 	"github.com/stretchr/testify/require"
+	"go.uber.org/goleak"
 )
 
 func TestSchemaTableRun(t *testing.T) {
+	// The goroutine which deletes expired entries runs indefinitely,
+	// see https://github.com/hashicorp/golang-lru/blob/v2.0.7/expirable/expirable_lru.go#L79-L80
+	defer goleak.VerifyNone(t, goleak.IgnoreTopFunction("github.com/hashicorp/golang-lru/v2/expirable.NewLRU[...].func1"))
+
 	db, mock, err := sqlmock.New(sqlmock.QueryMatcherOption(sqlmock.QueryMatcherEqual))
 	require.NoError(t, err)
 	defer db.Close()