core: referencing arrays/lists when using `crossRegionReferences` fails with "SerializationException: Start of list found where not expected"

### Describe the bug

When creating stacks with `crossRegionReferences` enabled, and the stack exposes a list/array value that is to be read in another region, the `Custom::CrossRegionExportWriter` resource will fail during creation with the error "SerializationException: Start of list found where not expected". Reading string values works fine, but if it's an array/list, it will fail.

### Regression Issue

- [ ] Select this option if this issue appears to be a regression.

### Last Known Working CDK Version

_No response_

### Expected Behavior

I expect to be able to reference lists/arrays from a stack in another region like I would strings.

### Current Behavior

The `Custom::CrossRegionExportWriter` resource fails during creation with the error "SerializationException: Start of list found where not expected":

```
BugVPCStack-us-west-2
BugVPCStack-us-west-2: deploying... [1/4]
Bug-VPC1-Requests-VPC2: start: Building bc980b3b9776ac14eeed5eeecde033423deae6a101589e745c39d5e53e119d87:current_account-us-west-2
Bug-VPC1-Requests-VPC2: success: Built bc980b3b9776ac14eeed5eeecde033423deae6a101589e745c39d5e53e119d87:current_account-us-west-2
Bug-VPC2-Accepts-VPC1: start: Building a7bb53c2fb4a92a7dcc01a0863f4145f4161926cdb3d34becc9fe4a65ce54566:current_account-us-east-1
Bug-VPC2-Accepts-VPC1: success: Built a7bb53c2fb4a92a7dcc01a0863f4145f4161926cdb3d34becc9fe4a65ce54566:current_account-us-east-1
BugVPCStack-us-west-2: creating CloudFormation changeset...
3:14:45 PM | UPDATE_FAILED | Custom::CrossRegionExportWriter | ExportsWriteruseast10F67B507DDE2E818
Received response status [FAILED] from custom resource. Message returned: SerializationException: Start of list found where not expected
at throwDefaultError (/var/runtime/node_modules/@aws-sdk/node_modules/@smithy/smithy-client/dist-cjs/index.js:840:20)
at /var/runtime/node_modules/@aws-sdk/node_modules/@smithy/smithy-client/dist-cjs/index.js:849:5
at de_CommandError (/var/runtime/node_modules/@aws-sdk/client-ssm/dist-cjs/index.js:7021:14)
at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
at async /var/runtime/node_modules/@aws-sdk/node_modules/@smithy/middleware-serde/dist-cjs/index.js:35:20
at async /var/runtime/node_modules/@aws-sdk/node_modules/@smithy/core/dist-cjs/index.js:165:18
at async /var/runtime/node_modules/@aws-sdk/node_modules/@smithy/middleware-retry/dist-cjs/index.js:320:38
at async /var/runtime/node_modules/@aws-sdk/middleware-logger/dist-cjs/index.js:34:22
at async Promise.all (index 0)
at async u (/var/task/index.js:3:330) (RequestId: f443b2b6-c5f3-49e6-98ce-eec9f39ef19d)

❌ BugVPCStack-us-west-2 failed: Error: The stack named BugVPCStack-us-west-2 failed to deploy: UPDATE_ROLLBACK_COMPLETE: Received response status [FAILED] from custom resource. Message returned: SerializationException: Start of list found where not expected
at throwDefaultError (/var/runtime/node_modules/@aws-sdk/node_modules/@smithy/smithy-client/dist-cjs/index.js:840:20)
at /var/runtime/node_modules/@aws-sdk/node_modules/@smithy/smithy-client/dist-cjs/index.js:849:5
at de_CommandError (/var/runtime/node_modules/@aws-sdk/client-ssm/dist-cjs/index.js:7021:14)
at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
at async /var/runtime/node_modules/@aws-sdk/node_modules/@smithy/middleware-serde/dist-cjs/index.js:35:20
at async /var/runtime/node_modules/@aws-sdk/node_modules/@smithy/core/dist-cjs/index.js:165:18
at async /var/runtime/node_modules/@aws-sdk/node_modules/@smithy/middleware-retry/dist-cjs/index.js:320:38
at async /var/runtime/node_modules/@aws-sdk/middleware-logger/dist-cjs/index.js:34:22
at async Promise.all (index 0)
at async u (/var/task/index.js:3:330) (RequestId: f443b2b6-c5f3-49e6-98ce-eec9f39ef19d)
at FullCloudFormationDeployment.monitorDeployment (/Users/aang/Code/Work/repos/core/cdk/Vpc-Peering/node_modules/aws-cdk/lib/index.js:458:10567)
at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
at async Object.deployStack2 [as deployStack] (/Users/aang/Code/Work/repos/core/cdk/Vpc-Peering/node_modules/aws-cdk/lib/index.js:461:200334)
at async /Users/aang/Code/Work/repos/core/cdk/Vpc-Peering/node_modules/aws-cdk/lib/index.js:461:181756

❌ Deployment failed: Error: The stack named BugVPCStack-us-west-2 failed to deploy: UPDATE_ROLLBACK_COMPLETE: Received response status [FAILED] from custom resource. Message returned: SerializationException: Start of list found where not expected
at throwDefaultError (/var/runtime/node_modules/@aws-sdk/node_modules/@smithy/smithy-client/dist-cjs/index.js:840:20)
at /var/runtime/node_modules/@aws-sdk/node_modules/@smithy/smithy-client/dist-cjs/index.js:849:5
at de_CommandError (/var/runtime/node_modules/@aws-sdk/client-ssm/dist-cjs/index.js:7021:14)
at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
at async /var/runtime/node_modules/@aws-sdk/node_modules/@smithy/middleware-serde/dist-cjs/index.js:35:20
at async /var/runtime/node_modules/@aws-sdk/node_modules/@smithy/core/dist-cjs/index.js:165:18
at async /var/runtime/node_modules/@aws-sdk/node_modules/@smithy/middleware-retry/dist-cjs/index.js:320:38
at async /var/runtime/node_modules/@aws-sdk/middleware-logger/dist-cjs/index.js:34:22
at async Promise.all (index 0)
at async u (/var/task/index.js:3:330) (RequestId: f443b2b6-c5f3-49e6-98ce-eec9f39ef19d)
at FullCloudFormationDeployment.monitorDeployment (/Users/aang/Code/Work/repos/core/cdk/Vpc-Peering/node_modules/aws-cdk/lib/index.js:458:10567)
at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
at async Object.deployStack2 [as deployStack] (/Users/aang/Code/Work/repos/core/cdk/Vpc-Peering/node_modules/aws-cdk/lib/index.js:461:200334)
at async /Users/aang/Code/Work/repos/core/cdk/Vpc-Peering/node_modules/aws-cdk/lib/index.js:461:181756

The stack named BugVPCStack-us-west-2 failed to deploy: UPDATE_ROLLBACK_COMPLETE: Received response status [FAILED] from custom resource. Message returned: SerializationException: Start of list found where not expected
at throwDefaultError (/var/runtime/node_modules/@aws-sdk/node_modules/@smithy/smithy-client/dist-cjs/index.js:840:20)
at /var/runtime/node_modules/@aws-sdk/node_modules/@smithy/smithy-client/dist-cjs/index.js:849:5
at de_CommandError (/var/runtime/node_modules/@aws-sdk/client-ssm/dist-cjs/index.js:7021:14)
at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
at async /var/runtime/node_modules/@aws-sdk/node_modules/@smithy/middleware-serde/dist-cjs/index.js:35:20
at async /var/runtime/node_modules/@aws-sdk/node_modules/@smithy/core/dist-cjs/index.js:165:18
at async /var/runtime/node_modules/@aws-sdk/node_modules/@smithy/middleware-retry/dist-cjs/index.js:320:38
at async /var/runtime/node_modules/@aws-sdk/middleware-logger/dist-cjs/index.js:34:22
at async Promise.all (index 0)
at async u (/var/task/index.js:3:330) (RequestId: f443b2b6-c5f3-49e6-98ce-eec9f39ef19d)
```

### Reproduction Steps

By default, the app will be created in a way that does not trigger the bug. To deploy the app as-is:
```
cdk bootstrap
cdk deploy --all --app 'node app.ts'
```

This should create the stacks successfully. Then run another deployment with a context variable:
```
cdk deploy --all --app 'node app.ts' --context readIPv6=true
```

This will instruct the app to reference list values in a cross-region manager and trigger the bug.

The bug occurs whether you create the stack with or without the context variable set; that is to say, if you create the stack with the context variable, the bug will also be triggered in that circumstance.

**app.ts:**
```typescript
#!/usr/bin/env node
import 'source-map-support/register';
import * as cdk from 'aws-cdk-lib';

interface VpcStackProps extends cdk.StackProps {
readonly cidr: string;
}

class VpcStack extends cdk.Stack {
public readonly vpcId: string;
public readonly vpcCidrIpV4: string;
public readonly vpcCidrIpV6: string;
public readonly vpcCidrIpV6List: string[];

public constructor(scope: cdk.App, id: string, props: VpcStackProps) {
super(scope, id, props);

const vpc = new ec2.Vpc(this, 'Bug VPC', {
ipAddresses: ec2.IpAddresses.cidr(props.cidr),
ipProtocol: ec2.IpProtocol.DUAL_STACK,
createInternetGateway: false,
maxAzs: 3,
subnetConfiguration: [
{
cidrMask: 28,
name: 'private',
subnetType: ec2.SubnetType.PRIVATE_ISOLATED,
}
]
})

this.vpcId = vpc.vpcId
this.vpcCidrIpV4 = vpc.vpcCidrBlock

// Both the selected value and the original list value will trigger the bug
this.vpcCidrIpV6 = cdk.Fn.select(0, vpc.vpcIpv6CidrBlocks)
this.vpcCidrIpV6List = vpc.vpcIpv6CidrBlocks
}
}

function createVpcStack(region: string, cidr: string) {
const stack = new VpcStack(app, `BugVPCStack-${region}`, {
env: { region },
crossRegionReferences: true,
cidr
})

return stack
}

const ec2 = cdk.aws_ec2
const app = new cdk.App();

const vpc1Stack = createVpcStack('us-west-2', '10.16.0.0/16')
const vpc2Stack = createVpcStack('us-east-1', '10.17.0.0/16')

const requesterStack = new cdk.Stack(app, `Bug-VPC1-Requests-VPC2`, {
env: { region: vpc1Stack.region },
crossRegionReferences: true
})

const readIPv6 = app.node.tryGetContext('readIPv6')
const values = [
vpc1Stack.vpcId!,
vpc1Stack.vpcCidrIpV4!,
vpc2Stack.vpcId!,
vpc2Stack.vpcCidrIpV4!,
...(readIPv6
? [
vpc1Stack.vpcCidrIpV6!,
vpc2Stack.vpcCidrIpV6!,
]
: [])
]

new cdk.aws_ssm.StringListParameter(requesterStack, 'sourceVpc', {
stringListValue: values,
})

if (readIPv6) new cdk.aws_ssm.StringListParameter(requesterStack, 'sourceVpcIpv6', {
stringListValue: vpc2Stack.vpcCidrIpV6List!,
})

const accepterStack = new cdk.Stack(app, `Bug-VPC2-Accepts-VPC1`, {
env: { region: vpc2Stack.region },
crossRegionReferences: true
})

new cdk.aws_ssm.StringListParameter(accepterStack, 'sourceVpc', {
stringListValue: values,
})

if (readIPv6) new cdk.aws_ssm.StringListParameter(accepterStack, 'sourceVpcIpv6', {
stringListValue: vpc1Stack.vpcCidrIpV6List!,
})
```

### Possible Solution

_No response_

### Additional Information/Context

_No response_

### CDK CLI Version

2.158.0

### Framework Version

_No response_

### Node.js Version

20.15.0

### OS

macOS 14.6.1

### Language

TypeScript

### Language Version

5.5.4

### Other information

_No response_

Start with the reproduction in app.ts and run cdk bootstrap followed by the two cdk deploy commands, including --context readIPv6=true. Trace the Custom::CrossRegionExportWriter failure when vpcCidrIpV6List is referenced across regions; done means cross-region list or array values deploy successfully without the SerializationException.

Written by the indexing model from the issue text.