### 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
if "Name" not in kwargs:
            kwargs["Name"] = "test-topic-%s" % short_uid()
        response = sns_client.create_topic(**kwargs)
        topic_arns.append(response["TopicArn"])
        return response
    yield _create_topic
    for topic_arn in topic_arns:
        try:
            sns_client.delete_topic(TopicArn=topic_arn)
        except Exception as e:
            LOG.debug("error cleaning up topic %s: %s", topic_arn, e)
@pytest.fixture
def sns_subscription(sns_client):
    sub_arns = []
    def _create_sub(**kwargs):
        if kwargs.get("ReturnSubscriptionArn") is None:
            kwargs["ReturnSubscriptionArn"] = True
        
        response = sns_client.subscribe(**kwargs)
        sub_arn = response["SubscriptionArn"]
        sub_arns.append(sub_arn)
        return response
    yield _create_sub
    for sub_arn in sub_arns:
        try:
            sns_client.unsubscribe(SubscriptionArn=sub_arn)
        except Exception as e:
            LOG.debug(f"error cleaning up subscription {sub_arn}: {e}")
@pytest.fixture
def sns_topic(sns_client, sns_create_topic) -> "GetTopicAttributesResponseTypeDef":