Revert "fix pipeline unit tests"

This reverts commit 19532af.

packages/@aws-cdk/aws-codepipeline/test/pipeline.test.ts

@@ -5,7 +5,6 @@ import * as kms from '@aws-cdk/aws-kms';
 import * as s3 from '@aws-cdk/aws-s3';
 import * as cdk from '@aws-cdk/core';
 import * as cxapi from '@aws-cdk/cx-api';
-import { testLegacyBehavior } from 'cdk-build-tools/lib/feature-flag';
 import * as codepipeline from '../lib';
 import { FakeBuildAction } from './fake-build-action';
 import { FakeSourceAction } from './fake-source-action';
@@ -68,8 +67,9 @@ describe('', () => {
 
       });
 
-      // only support legacy behavior. see https://github.com/aws/aws-cdk/issues/12921
-      testLegacyBehavior('allows passing an Alias in place of the KMS Key in the replication Bucket', cdk.App, (app) => {
+      test('allows passing an Alias in place of the KMS Key in the replication Bucket', () => {
+        const app = new cdk.App();
+
         const replicationRegion = 'us-west-1';
         const replicationStack = new cdk.Stack(app, 'ReplicationStack', {
           env: { region: replicationRegion, account: '123456789012' },
@@ -175,8 +175,8 @@ describe('', () => {
 
       });
 
-      // only support legacy behavior. see https://github.com/aws/aws-cdk/issues/12921
-      testLegacyBehavior('generates ArtifactStores with the alias ARN as the KeyID', cdk.App, (app) => {
+      test('generates ArtifactStores with the alias ARN as the KeyID', () => {
+        const app = new cdk.App();
         const replicationRegion = 'us-west-1';
 
         const pipelineRegion = 'us-west-2';
@@ -298,8 +298,7 @@ describe('', () => {
 
       });
 
-      // only support legacy behavior. see https://github.com/aws/aws-cdk/issues/12921
-      testLegacyBehavior('generates the support stack containing the replication Bucket without the need to bootstrap in that environment', cdk.App, () => {
+      test('generates the support stack containing the replication Bucket without the need to bootstrap in that environment', () => {
         const app = new cdk.App({
           treeMetadata: false, // we can't set the context otherwise, because App will have a child
         });