fix(lambda-nodejs): fixing esbuildArgs to take in account re-specified keys (#29167)

### Issue # (if applicable)
Closes #25385 

### Reason for this change
This PR fixes a bug in CDK where CDK does not take into account re-specified keys while doing bundling. The CLI supports flags in one of three forms: `--foo`, `--foo=bar`, or `--foo:bar`. However, the `--foo:bar` form was not initially supported. 
With `--foo:bar`, users can now specify flags that have multiple values and can be re-specified multiple times.

### Description of changes
The code has a list of keys that can be re-specified multiple times. While assigning the flags it checks whether the key is among the list of re-specified keys, if yes, it specifies the flag with `:`.

### Description of how you validated changes
The PR includes unit test and integration test both to validate the changes.

### 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: Vandita2020

packages/@aws-cdk-testing/framework-integ/test/aws-lambda-nodejs/test/integ.esbuildArgs.js.snapshot/LambdaNodeJsEsbuildArgsIntegDefaultTestDeployAssertB1F5AACE.assets.json

@@ -0,0 +1,96 @@
+{
+ "Resources": {
+  "tshandlerServiceRole8876B8E7": {
+   "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"
+       ]
+      ]
+     }
+    ]
+   }
+  },
+  "tshandler4E1C6929": {
+   "Type": "AWS::Lambda::Function",
+   "Properties": {
+    "Code": {
+     "S3Bucket": {
+      "Fn::Sub": "cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}"
+     },
+     "S3Key": "5017e4b2e278e32bc634202d075b7ed8961b0d784f75450f7918a6a4f6f7df4a.zip"
+    },
+    "Environment": {
+     "Variables": {
+      "AWS_NODEJS_CONNECTION_REUSE_ENABLED": "1"
+     }
+    },
+    "Handler": "index.handler",
+    "Role": {
+     "Fn::GetAtt": [
+      "tshandlerServiceRole8876B8E7",
+      "Arn"
+     ]
+    },
+    "Runtime": "nodejs18.x"
+   },
+   "DependsOn": [
+    "tshandlerServiceRole8876B8E7"
+   ]
+  }
+ },
+ "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."
+    }
+   ]
+  }
+ }
+}