(dynamodb): Tags not propagated to CfnGlobalTable

### Describe the bug

Tags are not propagated to CfnGlobalTable despite it being a taggable resource

### Expected Behavior

I expect tags to be created on my Global Tables

### Current Behavior

Tags are not created on Global Tables

### Reproduction Steps

Attempt to tag to a CfnGlobalTable

```
const table = new ddb.CfnGlobalTable(this, 'GlobalTable', {
attributeDefinitions: [
{
attributeName: 'id',
attributeType: 'string'
}
],
keySchema: [
{
attributeName: 'name',
keyType: 'HASH'
}
],
replicas: [
{
region: 'us-east-2'
}
]
});
Tags.of(table).add('key', 'value');
```

### Possible Solution

This doesn't work because tags are a second level property of `CfnGlobalTable` - tags are applied per replica https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-dynamodb-globaltable-replicaspecification.html

### Additional Information/Context

_No response_

### CDK CLI Version

2.78.0

### Framework Version

_No response_

### Node.js Version

.

### OS

.

### Language

Typescript

### Language Version

_No response_

### Other information

_No response_

The issue centers on CfnGlobalTable and its replicas property; start by tracing how Tags.of(table).add is translated for this resource. Compare the CloudFormation ReplicaSpecification tagging behavior in the linked AWS documentation, then add coverage for the provided TypeScript reproduction and verify that tags are emitted for each replica.

Written by the indexing model from the issue text.