fix(triggers): errors are shown as list of bytes (#27119)

With Triggers a user can invoke a Lambda Function during every stack deployment.

When we migrated the handler code to SDKv3, we overlooked that the return payload from the invoked lambda function is now a `Uint8Array`, and not a string anymore.
In the error case, we attempt to `JSON.parse()` the error payload which then resulted in a list of bytes being returned to the user.

Updated the handler test case to use correct mocks, including returning a payload that is a Uint8Array.

Closes #27113

----

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

Author: mrgrain

packages/@aws-cdk-testing/framework-integ/test/triggers/test/integ.triggers.js.snapshot/MyStack.assets.json

@@ -1,15 +1,15 @@
 {
   "version": "34.0.0",
   "files": {
-    "1c4fbe52107a02bc3832ff0608df37583b37909cc2fb431f405c157fdc63b2e1": {
+    "a0c9975917e46ed0aa8a6428132c7b9164aa1ef177f38f962f1def169eddf951": {
       "source": {
-        "path": "asset.1c4fbe52107a02bc3832ff0608df37583b37909cc2fb431f405c157fdc63b2e1",
+        "path": "asset.a0c9975917e46ed0aa8a6428132c7b9164aa1ef177f38f962f1def169eddf951",
         "packaging": "zip"
       },
       "destinations": {
         "current_account-current_region": {
           "bucketName": "cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}",
-          "objectKey": "1c4fbe52107a02bc3832ff0608df37583b37909cc2fb431f405c157fdc63b2e1.zip",
+          "objectKey": "a0c9975917e46ed0aa8a6428132c7b9164aa1ef177f38f962f1def169eddf951.zip",
           "assumeRoleArn": "arn:${AWS::Partition}:iam::${AWS::AccountId}:role/cdk-hnb659fds-file-publishing-role-${AWS::AccountId}-${AWS::Region}"
         }
       }
@@ -27,15 +27,15 @@
         }
       }
     },
-    "239e1222881873abff6cdef51f8e3c638744b51baa96c81ce6d806f327d47c64": {
+    "5deea9a1098892456fc282a7590321fe178d26a3ea864fd5c11fa2e392fe574c": {
       "source": {
         "path": "MyStack.template.json",
         "packaging": "file"
       },
       "destinations": {
         "current_account-current_region": {
           "bucketName": "cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}",
-          "objectKey": "239e1222881873abff6cdef51f8e3c638744b51baa96c81ce6d806f327d47c64.json",
+          "objectKey": "5deea9a1098892456fc282a7590321fe178d26a3ea864fd5c11fa2e392fe574c.json",
           "assumeRoleArn": "arn:${AWS::Partition}:iam::${AWS::AccountId}:role/cdk-hnb659fds-file-publishing-role-${AWS::AccountId}-${AWS::Region}"
         }
       }

packages/@aws-cdk-testing/framework-integ/test/triggers/test/integ.triggers.js.snapshot/MyStack.template.json

@@ -238,7 +238,7 @@
      "S3Bucket": {
       "Fn::Sub": "cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}"
      },
-     "S3Key": "1c4fbe52107a02bc3832ff0608df37583b37909cc2fb431f405c157fdc63b2e1.zip"
+     "S3Key": "a0c9975917e46ed0aa8a6428132c7b9164aa1ef177f38f962f1def169eddf951.zip"
     },
     "Timeout": 900,
     "MemorySize": 128,

packages/@aws-cdk-testing/framework-integ/test/triggers/test/integ.triggers.js.snapshot/TriggerTestDefaultTestDeployAssert61636546.assets.json

@@ -1,28 +1,28 @@
 {
   "version": "34.0.0",
   "files": {
-    "77997674c0a10fbb65169124ad6c0d7a664b6162ad44f9abfa22fd006b33f754": {
+    "f9eeaca5689691166106a01e96cb24972dd459c0e44c46f71d5a71a351954971": {
       "source": {
-        "path": "asset.77997674c0a10fbb65169124ad6c0d7a664b6162ad44f9abfa22fd006b33f754.bundle",
+        "path": "asset.f9eeaca5689691166106a01e96cb24972dd459c0e44c46f71d5a71a351954971.bundle",
         "packaging": "zip"
       },
       "destinations": {
         "current_account-current_region": {
           "bucketName": "cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}",
-          "objectKey": "77997674c0a10fbb65169124ad6c0d7a664b6162ad44f9abfa22fd006b33f754.zip",
+          "objectKey": "f9eeaca5689691166106a01e96cb24972dd459c0e44c46f71d5a71a351954971.zip",
           "assumeRoleArn": "arn:${AWS::Partition}:iam::${AWS::AccountId}:role/cdk-hnb659fds-file-publishing-role-${AWS::AccountId}-${AWS::Region}"
         }
       }
     },
-    "187dc9b0238204b903862ffef4a8cb4b20d9c18d252845731a6a0bfe60114ed7": {
+    "8592b210c476c91c8b979c0709e8da1bf3a1a5d12ef0bcc8bbbe8ed17ca45378": {
       "source": {
         "path": "TriggerTestDefaultTestDeployAssert61636546.template.json",
         "packaging": "file"
       },
       "destinations": {
         "current_account-current_region": {
           "bucketName": "cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}",
-          "objectKey": "187dc9b0238204b903862ffef4a8cb4b20d9c18d252845731a6a0bfe60114ed7.json",
+          "objectKey": "8592b210c476c91c8b979c0709e8da1bf3a1a5d12ef0bcc8bbbe8ed17ca45378.json",
           "assumeRoleArn": "arn:${AWS::Partition}:iam::${AWS::AccountId}:role/cdk-hnb659fds-file-publishing-role-${AWS::AccountId}-${AWS::Region}"
         }
       }

packages/@aws-cdk-testing/framework-integ/test/triggers/test/integ.triggers.js.snapshot/TriggerTestDefaultTestDeployAssert61636546.template.json

@@ -35,7 +35,7 @@
     "outputPaths": [
      "Messages.0.Body"
     ],
-    "salt": "1694456719494"
+    "salt": "1694604354167"
    },
    "UpdateReplacePolicy": "Delete",
    "DeletionPolicy": "Delete"
@@ -215,7 +215,7 @@
      "S3Bucket": {
       "Fn::Sub": "cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}"
      },
-     "S3Key": "77997674c0a10fbb65169124ad6c0d7a664b6162ad44f9abfa22fd006b33f754.zip"
+     "S3Key": "f9eeaca5689691166106a01e96cb24972dd459c0e44c46f71d5a71a351954971.zip"
     },
     "Timeout": 120,
     "Handler": "index.handler",
@@ -276,7 +276,7 @@
      "S3Bucket": {
       "Fn::Sub": "cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}"
      },
-     "S3Key": "77997674c0a10fbb65169124ad6c0d7a664b6162ad44f9abfa22fd006b33f754.zip"
+     "S3Key": "f9eeaca5689691166106a01e96cb24972dd459c0e44c46f71d5a71a351954971.zip"
     },
     "Timeout": 120,
     "Handler": "index.isComplete",
@@ -318,7 +318,7 @@
      "S3Bucket": {
       "Fn::Sub": "cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}"
      },
-     "S3Key": "77997674c0a10fbb65169124ad6c0d7a664b6162ad44f9abfa22fd006b33f754.zip"
+     "S3Key": "f9eeaca5689691166106a01e96cb24972dd459c0e44c46f71d5a71a351954971.zip"
     },
     "Timeout": 120,
     "Handler": "index.onTimeout",