Stop background tasks and when stopping bleve backend. (#111249)

Co-authored-by: Stephanie Hingtgen <stephanie.hingtgen@grafana.com>

pkg/storage/unified/sql/test/integration_test.go

@@ -110,7 +110,7 @@ func TestIntegrationSearchAndStorage(t *testing.T) {
 	require.NoError(t, err)
 	require.NotNil(t, search)
 
-	t.Cleanup(search.CloseAllIndexes)
+	t.Cleanup(search.Stop)
 
 	// Create a new resource backend
 	storage := newTestBackend(t, false, 0)