Murko: Improve logging for redis_to_murko

Currently the `redis_to_murko` forwarder is using the k8s default logger that logs every line of `stdout` to e.g. https://graylog.diamond.ac.uk/search?q=container_name%3A%22mx-bluesky%22+AND+beamline%3A%22i04%22&rangetype=absolute&streams=659ffe96840b242b478da848&from=2025-02-11T03%3A35%3A06.000Z&to=2025-02-11T03%3A38%3A25.000Z

There are some issues with this:
* It's not easy to find the container in the stream
* The logs all get put in at the same error level
* The logs get put in per line so a multi-line error message becomes multiple messages

## Acceptance Criteria
- `redis_to_murko` controls it's own logging and the above is fixed for it