[chore][receiver/saphana] Enable goleak check (#32183)

Enable `goleak` check for the SAP HANA receiver to help ensure no
goroutines are being leaked.

**Link to tracking Issue:** #30438

receiver/saphanareceiver/package_test.go

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