### 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 "UserName" not in kwargs:
            kwargs["UserName"] = f"user-{short_uid()}"
        response = iam_client.create_user(**kwargs)
        usernames.append(response["User"]["UserName"])
        return response
    yield _create_user
    for username in usernames:
        inline_policies = iam_client.list_user_policies(UserName=username)["PolicyNames"]
        for inline_policy in inline_policies:
            try:
                iam_client.delete_user_policy(UserName=username, PolicyName=inline_policy)
            except Exception:
                LOG.debug(
                    "Could not delete user policy '%s' from '%s' during cleanup",
                    inline_policy,
                    username,
                )
        attached_policies = iam_client.list_attached_user_policies(UserName=username)[
            "AttachedPolicies"
        ]
        for attached_policy in attached_policies:
            try:
                iam_client.detach_user_policy(
                    UserName=username, PolicyArn=attached_policy["PolicyArn"]
                )
            except Exception:
                LOG.debug(
                    "Error detaching policy '%s' from user '%s'",
                    attached_policy["PolicyArn"],
                    username,