test: close tracer in TestNewInstrumentation tests (#17360) (#17363)

(cherry picked from commit 978d8b5)

Co-authored-by: kruskall <[email protected]>

Author: mergify[bot]

internal/beater/beater_test.go

@@ -311,6 +311,7 @@ func TestNewInstrumentation(t *testing.T) {
 	i, err := newInstrumentation(cfg, logptest.NewTestingLogger(t, ""))
 	require.NoError(t, err)
 	tracer := i.Tracer()
+	defer tracer.Close()
 	tracer.StartTransaction("name", "type").End()
 	tracer.Flush(nil)
 	assert.Equal(t, map[string]string{"k1": "val", "k2": "new val"}, <-labels)
@@ -343,6 +344,7 @@ func TestNewInstrumentationWithSampling(t *testing.T) {
 		i, err := newInstrumentation(cfg, logptest.NewTestingLogger(t, ""))
 		require.NoError(t, err)
 		tracer := i.Tracer()
+		defer tracer.Close()
 		tr := tracer.StartTransaction("name", "type")
 		tr.StartSpan("span", "type", nil).End()
 		tr.End()