### 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
def _is_change_set_finished(change_set_id: str, stack_name: Optional[str] = None):
        def _inner():
            kwargs = {"ChangeSetName": change_set_id}
            if stack_name:
                kwargs["StackName"] = stack_name
            check_set = cfn_client.describe_change_set(**kwargs)
            return check_set.get("ExecutionStatus") == "EXECUTE_COMPLETE"
        return _inner
    return _is_change_set_finished
@pytest.fixture
def wait_until_lambda_ready(lambda_client):
    def _wait_until_ready(function_name: str, qualifier: str = None):
        def _is_not_pending():
            kwargs = {}
            if qualifier:
                kwargs["Qualifier"] = qualifier
            try:
                result = (
                    lambda_client.get_function(FunctionName=function_name)["Configuration"]["State"]
                    != "Pending"
                )
                LOG.debug(f"lambda state result: {result=}")
                return result
            except Exception as e:
                LOG.error(e)
                raise
        wait_until(_is_not_pending)