### 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 not msg:
        msg = "The resource you requested does not exist."
        if ref:
            msg = "%s not found: %s" % (
                "Function" if ":function:" in ref else "Resource",
                ref,
            )
    return error_response(msg, 404, error_type="ResourceNotFoundException")
def delete_lambda_function(function_name: str) -> Dict[None, None]:
    arn = func_arn(function_name)
    region = LambdaRegion.get()
    
    LAMBDA_EXECUTOR.cleanup(arn)
    try:
        region.lambdas.pop(arn)
    except KeyError:
        raise ResourceNotFoundException(
            f"Unable to delete non-existing Lambda function {func_arn(function_name)}"
        )
    i = 0
    while i < len(region.event_source_mappings):
        mapping = region.event_source_mappings[i]
        if mapping["FunctionArn"] == arn:
            del region.event_source_mappings[i]
            i -= 1
        i += 1
    return {}
def get_lambda_url_config(api_id, region=None):
    lambda_backend = LambdaRegion.get(region)
    url_configs = lambda_backend.url_configs.values()