fix tests

Author: sincejune

service/defaultcomponents/default_exporters_test.go

@@ -180,17 +180,13 @@ func verifyExporterLifecycle(t *testing.T, factory component.ExporterFactory, ge
 	}
 
 	for i := 0; i < 2; i++ {
-		var exps []component.Exporter
 		for _, createFn := range createFns {
 			exp, err := createFn(ctx, expCreateParams, cfg)
 			if errors.Is(err, componenterror.ErrDataTypeIsNotSupported) {
 				continue
 			}
 			require.NoError(t, err)
 			require.NoError(t, exp.Start(ctx, host))
-			exps = append(exps, exp)
-		}
-		for _, exp := range exps {
 			assert.NoError(t, exp.Shutdown(ctx))
 		}
 	}