golabels: fix race condition (open-telemetry#744)

Signed-off-by: Florian Lehner <florian.lehner@elastic.co>

Author: florianl

interpreter/golabels/integrationtests/golabels_integration_test.go

@@ -121,7 +121,12 @@ func Test_Golabels(t *testing.T) {
 
 			go func() {
 				if err := exec.CommandContext(ctx, exe.Name()).Run(); err != nil {
-					t.Log(err)
+					select {
+					case <-ctx.Done():
+						// Context is canceled, meaning the test is done.
+					default:
+						t.Log(err)
+					}
 				}
 			}()