### Is there an existing issue for this?

- [X] I have searched the existing issues

### Feature description

Basically we want to only run the lambda when an insert is occurring in DynamoDB.
I tested using Dynobase deleting a record and the lambda still triggered.

```
resource "aws_lambda_event_source_mapping" "event-log" {
	event_source_arn  = aws_dynamodb_table.event-log.stream_arn
	function_name     = module.main.lambda-arn
	starting_position = "LATEST"
	enabled = true # change to false when truncating the table in localstack
	maximum_retry_attempts = 1 # limit retry on failure to 1 for now

	# https://dev.to/aws-builders/filtering-dynamodb-streams-before-lambda-p5p
	filter_criteria { # Doesn't seem to work on LocalStack for now
		filter {
			pattern = jsonencode({
				body = {
					eventName : ["INSERT"]
				}
			})
		}
	}
}
```


### 🧑‍💻 Implementation

_No response_

### Anything else?

 https://dev.to/aws-builders/filtering-dynamodb-streams-before-lambda-p5p
topic_arn = sns_create_topic()["TopicArn"]
    return sns_client.get_topic_attributes(TopicArn=topic_arn)
@pytest.fixture
def sns_allow_topic_sqs_queue(sqs_client):
    def _allow_sns_topic(sqs_queue_url, sqs_queue_arn, sns_topic_arn) -> None:
        
        sqs_client.set_queue_attributes(
            QueueUrl=sqs_queue_url,
            Attributes={
                "Policy": json.dumps(
                    {
                        "Statement": [
                            {
                                "Effect": "Allow",
                                "Principal": {"Service": "sns.amazonaws.com"},
                                "Action": "sqs:SendMessage",
                                "Resource": sqs_queue_arn,
                                "Condition": {"ArnEquals": {"aws:SourceArn": sns_topic_arn}},
                            }
                        ]
                    }
                )
            },
        )
    return _allow_sns_topic
@pytest.fixture
def sns_create_sqs_subscription(sns_client, sqs_client, sns_allow_topic_sqs_queue):