chore(lambda-nodejs): update integration test for bundling (#33679)

### Issue # (if applicable)

Closes #NA.

### Reason for this change

Plan to change default user to a be non-root for bundling process.

### Description of changes

- Added integration test for all packages that use dockerfile for bundling and will be affected with further changes.
- Added bootstrap file binary to be identified as an LFS under .gitattribute 
- Updated contributing guide to let users know that git lfs install is needed to handle large file changes.

### Describe any new or updated permissions being added

NA


### Description of how you validated changes

yarn build
yarn integ

### 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: shikha372

.gitattributes

@@ -16,3 +16,4 @@
 packages/@aws-cdk-testing/framework-integ/test/aws-s3-deployment/test/integ.bucket-deployment-big-response.js.snapshot/asset.3322b7049fb0ed2b7cbb644a2ada8d1116ff80c32dca89e6ada846b5de26f961.zip filter=lfs diff=lfs merge=lfs -text
 packages/@aws-cdk-testing/framework-integ/test/**/*.snapshot/**/asset*.zip filter=lfs diff=lfs merge=lfs -text
 packages/@aws-cdk/*-alpha/test/**/*.snapshot/**/asset*.zip filter=lfs diff=lfs merge=lfs -text
+packages/@aws-cdk/*-alpha/test/*.snapshot/asset.*/bootstrap filter=lfs diff=lfs merge=lfs -text

CONTRIBUTING.md

@@ -154,6 +154,7 @@ Another reason we hear from authors that they don't want to publish their own pa
 
 ### Setup
 Fork the aws-cdk repository into your account: https://github.com/aws/aws-cdk/fork
+Note: Install Git LFS using `git lfs install` command, as it is necessary for handling large file changes.
 
 Clone the forked repository:
 ```console

packages/@aws-cdk-testing/framework-integ/test/aws-lambda-nodejs/test/integ.bundling-user.js.snapshot/BundlingUserTestDefaultTestDeployAssert0895CAA6.assets.json

@@ -0,0 +1,91 @@
+{
+ "Resources": {
+  "tsdecoratorhandlerrootuserServiceRole7E60BF99": {
+   "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"
+       ]
+      ]
+     }
+    ]
+   }
+  },
+  "tsdecoratorhandlerrootuser49139373": {
+   "Type": "AWS::Lambda::Function",
+   "Properties": {
+    "Code": {
+     "S3Bucket": {
+      "Fn::Sub": "cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}"
+     },
+     "S3Key": "659fc275dc398d5f03ea5459bcc3898cca70adfa711dd30a29d749215d2990cb.zip"
+    },
+    "Handler": "index.handler",
+    "Role": {
+     "Fn::GetAtt": [
+      "tsdecoratorhandlerrootuserServiceRole7E60BF99",
+      "Arn"
+     ]
+    },
+    "Runtime": "nodejs18.x"
+   },
+   "DependsOn": [
+    "tsdecoratorhandlerrootuserServiceRole7E60BF99"
+   ]
+  }
+ },
+ "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."
+    }
+   ]
+  }
+ }
+}