private Slime toSlime(InputStream jsonStream) {
        try {
            byte[] jsonBytes = IOUtils.readBytes(jsonStream, 1000 * 1000);
            return SlimeUtils.jsonToSlime(jsonBytes);
        } catch (IOException e) {
            throw new RuntimeException();
        }
    }
Attempts to validate the AWS Systems Manager Parameter Store settings to see if we can
run a working Vespa Cloud Secret Store with them.

@author ogronnesby
jdisc-cloud-aws/src/main/java/com/yahoo/jdisc/cloud/aws/AwsParameterStoreValidationHandler.java