fix(integ-tests): Uint8Arrays are not decoded properly (#27009)

AWS SDK v3 has changed some data types to Uint8Array. If a value of this type was provided by the user, it would not be decoded properly back to a Uint8Array before making the call.

Recognize when there is an encoded Uint8Array and decode it back properly.

Closes #26798.

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

Author: otaviomacedo

packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.binary-payload.js.snapshot/IntegBinaryPayload.assets.json

@@ -0,0 +1,19 @@
+{
+  "version": "34.0.0",
+  "files": {
+    "e4cbaa0fcf23495e4d555f44c97cf3fdd0bbd04ce558a02ba6a79f7ae1944f60": {
+      "source": {
+        "path": "IntegBinaryPayload.template.json",
+        "packaging": "file"
+      },
+      "destinations": {
+        "current_account-current_region": {
+          "bucketName": "cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}",
+          "objectKey": "e4cbaa0fcf23495e4d555f44c97cf3fdd0bbd04ce558a02ba6a79f7ae1944f60.json",
+          "assumeRoleArn": "arn:${AWS::Partition}:iam::${AWS::AccountId}:role/cdk-hnb659fds-file-publishing-role-${AWS::AccountId}-${AWS::Region}"
+        }
+      }
+    }
+  },
+  "dockerImages": {}
+}

packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.binary-payload.js.snapshot/IntegBinaryPayload.template.json

@@ -0,0 +1,98 @@
+{
+ "Resources": {
+  "fnServiceRole5D180AFD": {
+   "Type": "AWS::IAM::Role",
+   "Properties": {
+    "AssumeRolePolicyDocument": {
+     "Statement": [
+      {
+       "Action": "sts:AssumeRole",
+       "Effect": "Allow",
+       "Principal": {
+        "Service": "lambda.amazonaws.com"
+       }
+      }
+     ],
+     "Version": "2012-10-17"
+    },
+    "ManagedPolicyArns": [
+     {
+      "Fn::Join": [
+       "",
+       [
+        "arn:",
+        {
+         "Ref": "AWS::Partition"
+        },
+        ":iam::aws:policy/service-role/AWSLambdaBasicExecutionRole"
+       ]
+      ]
+     }
+    ]
+   }
+  },
+  "fn5FF616E3": {
+   "Type": "AWS::Lambda::Function",
+   "Properties": {
+    "Code": {
+     "ZipFile": "\n    exports.handler = async (event) => {\n      return event;\n    };\n  "
+    },
+    "Handler": "index.handler",
+    "Role": {
+     "Fn::GetAtt": [
+      "fnServiceRole5D180AFD",
+      "Arn"
+     ]
+    },
+    "Runtime": "nodejs18.x"
+   },
+   "DependsOn": [
+    "fnServiceRole5D180AFD"
+   ]
+  }
+ },
+ "Outputs": {
+  "ExportsOutputReffn5FF616E3BE1A8BD6": {
+   "Value": {
+    "Ref": "fn5FF616E3"
+   },
+   "Export": {
+    "Name": "IntegBinaryPayload:ExportsOutputReffn5FF616E3BE1A8BD6"
+   }
+  }
+ },
+ "Parameters": {
+  "BootstrapVersion": {
+   "Type": "AWS::SSM::Parameter::Value<String>",
+   "Default": "/cdk-bootstrap/hnb659fds/version",
+   "Description": "Version of the CDK Bootstrap resources in this environment, automatically retrieved from SSM Parameter Store. [cdk:skip]"
+  }
+ },
+ "Rules": {
+  "CheckBootstrapVersion": {
+   "Assertions": [
+    {
+     "Assert": {
+      "Fn::Not": [
+       {
+        "Fn::Contains": [
+         [
+          "1",
+          "2",
+          "3",
+          "4",
+          "5"
+         ],
+         {
+          "Ref": "BootstrapVersion"
+         }
+        ]
+       }
+      ]
+     },
+     "AssertDescription": "CDK bootstrap stack version 6 required. Please run 'cdk bootstrap' with a recent version of the CDK CLI."
+    }
+   ]
+  }
+ }
+}