[extension/opampextension] Enable goleak check

extension/opampextension/go.mod

@@ -16,6 +16,7 @@ require (
 	go.opentelemetry.io/collector/semconv v0.95.0
 	go.opentelemetry.io/otel/metric v1.23.1
 	go.opentelemetry.io/otel/trace v1.23.1
+	go.uber.org/goleak v1.3.0
 	go.uber.org/zap v1.27.0
 	gopkg.in/yaml.v3 v3.0.1
 )

extension/opampextension/opamp_agent_test.go

@@ -113,4 +113,5 @@ func TestStart(t *testing.T) {
 	assert.NoError(t, err)
 
 	assert.NoError(t, o.Start(context.TODO(), componenttest.NewNopHost()))
+	assert.NoError(t, o.Shutdown(context.TODO()))
 }

extension/opampextension/package_test.go

@@ -0,0 +1,14 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package opampextension
+
+import (
+	"testing"
+
+	"go.uber.org/goleak"
+)
+
+func TestMain(m *testing.M) {
+	goleak.VerifyTestMain(m)
+}