### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

It seems that it is possible to receive sns message in an sqs listener if there is a filterpolicy in place for null value in a message attribute, and a message is being sent without the message attribute.

### Expected Behavior

Don't recieve these type of messages

### How are you starting LocalStack?

With a docker-compose file

### Steps To Reproduce

`sns subscribe --topic-arn "demoTopicArn"  --protocol sqs --notification-endpoint "demoSqsEndpoint" --attributes '{"RawMessageDelivery": "true"}'`
`sns set-subscription-attributes --subscription-arn demoSubsArn --attribute-name FilterPolicy --attribute-value '{"testForNull": [null,{"anything-but": ["notgood"]}]}'`
`sns publish --topic-arn demoTopicArn --message "testforrecieval"`
`sqs receive-message --queue-url  "demoUrl"`

### Environment

```markdown
- OS: macOS 13.6
- LocalStack: 2.2.0
```


### Anything else?

_No response_
subscription = sns_subscription(
                TopicArn=topic_arn, Protocol="http", Endpoint=http_endpoint
            )
            aws_client.sns.set_subscription_attributes(
                SubscriptionArn=subscription["SubscriptionArn"],
                AttributeName="RedrivePolicy",
                AttributeValue=json.dumps({"deadLetterTargetArn": dlq_arn}),
            )
            # w
            poll_condition(lambda: len(server.log) >= 1, timeout=10)
            request, _ = server.log[0]
            event = request.get_json(force=True)
            assert request.path.endswith("/subscription")
            assert event["Type"] == "SubscriptionConfirmation"
            assert event["TopicArn"] == topic_arn
            aws_client.sns.confirm_subscription(TopicArn=topic_arn, Token=event["Token"])
        wait_for_port_closed(server.port)
        aws_client.sns.publish(
            TopicArn=topic_arn,
            Message=json.dumps({"message": "test_redrive_policy"}),
        )
        response = aws_client.sqs.receive_message(QueueUrl=dlq_url, WaitTimeSeconds=10)
        assert (
            len(response["Messages"]) == 1
        ), f"invalid number of messages in DLQ response {response}"
        message = json.loads(response["Messages"][0]["Body"])
        assert message["Type"] == "Notification"
        assert json.loads(message["Message"])["message"] == "test_redrive_policy"
    @markers.aws.manual_setup_required
    def test_multiple_subscriptions_http_endpoint(