fix(pipelines): generates warning since CDK 2.128.0 due to addition of v2 pipeline support in aws-codepipeline (#29199)

### Issue # (if applicable)

Closes #29190 

### Reason for this change

CDK v2.128.0 introduced a warning in aws-codepipeline to warn users of the implicit behavior now that v2 pipelines are supported in CDK. This warning can cause established pipelines to fail if they are using cdk synth --strict. The warning can be suppressed, but the better fix is to have this module supply the `PipelineType` added in CDK v128.0 and set it to `v1`. A future change would have to address adding v2 pipeline support to this module, this only resolves the introduced warning. 

### Description of changes

- added the optional (and new) `PipelineType` property in the creation of the codepipeline in https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/pipelines/lib/codepipeline/codepipeline.ts#L467-L480
- slightly modified the README where it mentions using aws-codepipeline to include specifically an mention of v2 as a reason to use aws-codepipeline (until of course v2 is added properly in this lib)

### Description of how you validated changes

- reverted a change in 40ffe2b as I believe this previously caught the new warning and was changed to fix the test rather than looking into the new warning. This would catch the warning if `PipelineType` is not supplied

### Checklist
- [ x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: gossandr

packages/@aws-cdk-testing/framework-integ/test/pipelines/test/integ.newpipeline-with-codebuild-logging.js.snapshot/PipelineStack.assets.json

@@ -232,6 +232,14 @@
   "Pipeline9850B417": {
    "Type": "AWS::CodePipeline::Pipeline",
    "Properties": {
+    "ArtifactStore": {
+     "Location": {
+      "Ref": "PipelineArtifactsBucketAEA9A052"
+     },
+     "Type": "S3"
+    },
+    "PipelineType": "V1",
+    "RestartExecutionOnUpdate": true,
     "RoleArn": {
      "Fn::GetAtt": [
       "PipelineRoleB27FAA37",
@@ -1834,14 +1842,7 @@
       ],
       "Name": "Wave2"
      }
-    ],
-    "ArtifactStore": {
-     "Location": {
-      "Ref": "PipelineArtifactsBucketAEA9A052"
-     },
-     "Type": "S3"
-    },
-    "RestartExecutionOnUpdate": true
+    ]
    },
    "DependsOn": [
     "PipelineRoleDefaultPolicy7BDC1ABB",
@@ -1861,12 +1862,12 @@
       "MatchEquals": "refs/heads/{Branch}"
      }
     ],
+    "RegisterWithThirdParty": true,
     "TargetAction": "colifran_cdk-pipelines-demo",
     "TargetPipeline": {
      "Ref": "Pipeline9850B417"
     },
-    "TargetPipelineVersion": 1,
-    "RegisterWithThirdParty": true
+    "TargetPipelineVersion": 1
    }
   },
   "PipelineBuildSynthCdkBuildProjectRole231EEA2A": {
@@ -2101,28 +2102,18 @@
     "Artifacts": {
      "Type": "CODEPIPELINE"
     },
+    "Cache": {
+     "Type": "NO_CACHE"
+    },
+    "Description": "Pipeline step PipelineStack/Pipeline/Build/Synth",
+    "EncryptionKey": "alias/aws/s3",
     "Environment": {
      "ComputeType": "BUILD_GENERAL1_SMALL",
      "Image": "aws/codebuild/standard:7.0",
      "ImagePullCredentialsType": "CODEBUILD",
      "PrivilegedMode": false,
      "Type": "LINUX_CONTAINER"
     },
-    "ServiceRole": {
-     "Fn::GetAtt": [
-      "PipelineBuildSynthCdkBuildProjectRole231EEA2A",
-      "Arn"
-     ]
-    },
-    "Source": {
-     "BuildSpec": "{\n  \"version\": \"0.2\",\n  \"phases\": {\n    \"build\": {\n      \"commands\": [\n        \"npm ci\",\n        \"npm run build\",\n        \"npx cdk synth\"\n      ]\n    }\n  },\n  \"artifacts\": {\n    \"base-directory\": \"cdk.out\",\n    \"files\": \"**/*\"\n  }\n}",
-     "Type": "CODEPIPELINE"
-    },
-    "Cache": {
-     "Type": "NO_CACHE"
-    },
-    "Description": "Pipeline step PipelineStack/Pipeline/Build/Synth",
-    "EncryptionKey": "alias/aws/s3",
     "LogsConfig": {
      "CloudWatchLogs": {
       "GroupName": "log-group-name",
@@ -2132,6 +2123,16 @@
       "Location": "bucket-name",
       "Status": "ENABLED"
      }
+    },
+    "ServiceRole": {
+     "Fn::GetAtt": [
+      "PipelineBuildSynthCdkBuildProjectRole231EEA2A",
+      "Arn"
+     ]
+    },
+    "Source": {
+     "BuildSpec": "{\n  \"version\": \"0.2\",\n  \"phases\": {\n    \"build\": {\n      \"commands\": [\n        \"npm ci\",\n        \"npm run build\",\n        \"npx cdk synth\"\n      ]\n    }\n  },\n  \"artifacts\": {\n    \"base-directory\": \"cdk.out\",\n    \"files\": \"**/*\"\n  }\n}",
+     "Type": "CODEPIPELINE"
     }
    }
   },
@@ -2453,28 +2454,18 @@
     "Artifacts": {
      "Type": "CODEPIPELINE"
     },
+    "Cache": {
+     "Type": "NO_CACHE"
+    },
+    "Description": "Pipeline step PipelineStack/Pipeline/UpdatePipeline/SelfMutate",
+    "EncryptionKey": "alias/aws/s3",
     "Environment": {
      "ComputeType": "BUILD_GENERAL1_SMALL",
      "Image": "aws/codebuild/standard:7.0",
      "ImagePullCredentialsType": "CODEBUILD",
      "PrivilegedMode": false,
      "Type": "LINUX_CONTAINER"
     },
-    "ServiceRole": {
-     "Fn::GetAtt": [
-      "PipelineUpdatePipelineSelfMutationRole57E559E8",
-      "Arn"
-     ]
-    },
-    "Source": {
-     "BuildSpec": "{\n  \"version\": \"0.2\",\n  \"phases\": {\n    \"install\": {\n      \"commands\": [\n        \"npm install -g aws-cdk@2\"\n      ]\n    },\n    \"build\": {\n      \"commands\": [\n        \"cdk -a . deploy PipelineStack --require-approval=never --verbose\"\n      ]\n    }\n  }\n}",
-     "Type": "CODEPIPELINE"
-    },
-    "Cache": {
-     "Type": "NO_CACHE"
-    },
-    "Description": "Pipeline step PipelineStack/Pipeline/UpdatePipeline/SelfMutate",
-    "EncryptionKey": "alias/aws/s3",
     "LogsConfig": {
      "CloudWatchLogs": {
       "GroupName": "log-group-name",
@@ -2484,6 +2475,16 @@
       "Location": "bucket-name",
       "Status": "ENABLED"
      }
+    },
+    "ServiceRole": {
+     "Fn::GetAtt": [
+      "PipelineUpdatePipelineSelfMutationRole57E559E8",
+      "Arn"
+     ]
+    },
+    "Source": {
+     "BuildSpec": "{\n  \"version\": \"0.2\",\n  \"phases\": {\n    \"install\": {\n      \"commands\": [\n        \"npm install -g aws-cdk@2\"\n      ]\n    },\n    \"build\": {\n      \"commands\": [\n        \"cdk -a . deploy PipelineStack --require-approval=never --verbose\"\n      ]\n    }\n  }\n}",
+     "Type": "CODEPIPELINE"
     }
    }
   }