### 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
region = LambdaRegion.get()
    data = json.loads(request.data)
    signing_profile_version_arns = data.get("AllowedPublishers").get("SigningProfileVersionArns")
    code_signing_id = "csc-%s" % long_uid().replace("-", "")[0:17]
    arn = aws_stack.code_signing_arn(code_signing_id)
    region.code_signing_configs[arn] = CodeSigningConfig(
        arn, code_signing_id, signing_profile_version_arns
    )
    code_signing_obj = region.code_signing_configs[arn]
    if data.get("Description"):
        code_signing_obj.description = data["Description"]
    if data.get("CodeSigningPolicies", {}).get("UntrustedArtifactOnDeployment"):
        code_signing_obj.untrusted_artifact_on_deployment = data["CodeSigningPolicies"][
            "UntrustedArtifactOnDeployment"
        ]
    code_signing_obj.last_modified = format_timestamp()
    result = {
        "CodeSigningConfig": {
            "AllowedPublishers": {
                "SigningProfileVersionArns": code_signing_obj.signing_profile_version_arns
            },
            "CodeSigningConfigArn": code_signing_obj.arn,
            "CodeSigningConfigId": code_signing_obj.id,
            "CodeSigningPolicies": {
                "UntrustedArtifactOnDeployment": code_signing_obj.untrusted_artifact_on_deployment
            },