### 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
expected_length=1, function_name=function_name, logs_client=logs_client
            )
        finally:
            lambda_client.delete_event_source_mapping(UUID=uuid)
    
    def test_deletion_event_source_mapping_with_dynamodb(
        self, create_lambda_function, lambda_client, dynamodb_client, lambda_su_role
    ):
        try:
            function_name = f"lambda_func-{short_uid()}"
            ddb_table = f"ddb_table-{short_uid()}"
            create_lambda_function(
                func_name=function_name,
                handler_file=TEST_LAMBDA_PYTHON_ECHO,
                runtime=LAMBDA_RUNTIME_PYTHON36,
                role=lambda_su_role,
            )
            latest_stream_arn = aws_stack.create_dynamodb_table(
                table_name=ddb_table,
                partition_key="id",
                client=dynamodb_client,
                stream_view_type="NEW_IMAGE",
            )["TableDescription"]["LatestStreamArn"]
            result = lambda_client.create_event_source_mapping(
                FunctionName=function_name,
                EventSourceArn=latest_stream_arn,
                StartingPosition="TRIM_HORIZON",
            )
            event_source_mapping_uuid = result["UUID"]
            _await_dynamodb_table_active(dynamodb_client, ddb_table)