### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

Here are the kinesis events from inserting/deleting a dynamodb item:

```
{"eventID":"cf1199b0","eventVersion":"1.1","dynamodb":{"ApproximateCreationDateTime":1.635284406858227E9,"SizeBytes":56,"Keys":{"hash":{"S":"hash-691"},"range":{"S":"range-153"}},"NewImage":{"hash":{"S":"hash-691"},"range":{"S":"range-153"}}},"awsRegion":"us-east-1","eventSource":"aws:dynamodb","eventName":"INSERT","tableName":"bug"}

{"eventID":"976b515b","eventVersion":"1.1","dynamodb":{"ApproximateCreationDateTime":1.6352844070969691E9,"SizeBytes":4,"Keys":{"hash":{"S":"hash-691"},"range":{"S":"range-153"}},"OldImage":null},"awsRegion":"us-east-1","eventSource":"aws:dynamodb","eventName":"REMOVE","tableName":"bug"}
```

Note that the remove event has `OldImage` = `null`

### Expected Behavior

I expected `OldImage` to be `{"hash":{"S":"hash-691"},"range":{"S":"range-153"}}`.

### How are you starting LocalStack?

With a docker-compose file

### Steps To Reproduce

https://github.com/achaphiv/issue-localstack-dynamodb-stream-to-kinesis

```
# Create table/stream and hook them up
docker-compose up -d

# Create/delete an item
./mvnw -P write-to-dynamodb

# See the produced records
./mvnw -P watch-kinesis
```

### Environment

```markdown
- OS: Manjaro Linux
- LocalStack: 0.12.19
```


### Anything else?

_No response_
record = {
            "eventID": "1",
            "eventVersion": "1.1",
            "dynamodb": {
                "ApproximateCreationDateTime": time.time(),
                
                "SizeBytes": -1,
            },
            "awsRegion": aws_stack.get_region(),
            "eventSource": "aws:dynamodb",
        }
        records = [record]
        streams_enabled_cache = {}
        table_name = data.get("TableName")
        event_sources_or_streams_enabled = has_event_sources_or_streams_enabled(
            table_name, streams_enabled_cache
        )
        if action == "UpdateItem":
            if response.status_code == 200 and event_sources_or_streams_enabled:
                existing_item = self._thread_local("existing_item")
                record["eventName"] = "INSERT" if not existing_item else "MODIFY"
                record["eventID"] = short_uid()
                updated_item = find_existing_item(data)
                if not updated_item:
                    return
                record["dynamodb"]["Keys"] = data["Key"]
                if existing_item:
                    record["dynamodb"]["OldImage"] = existing_item
                record["dynamodb"]["NewImage"] = updated_item
                record["dynamodb"]["SizeBytes"] = len(json.dumps(updated_item))