Stop processing Murko results when redis sends end of rotation message

> Hmm... We should probably be able to stop based on a message from redis saying that we've reached the end of the rotation. Can you make an issue for that?

_Originally posted by @DominicOram in https://github.com/DiamondLightSource/dodal/pull/1175#discussion_r2100405307_

We should change the `murko_results` device to stop processing results once we get a message from redis saying we've reached the end of the rotation, rather than once we reach an arbitrary angle. If redis already provides such a message, we can just check each message to see if the rotation has ended. If not, we need to make sure such a message is sent.

Requires https://github.com/DiamondLightSource/dodal/pull/1175