[refactor] move container start/exit to up_pub
Move the container start/exit events to the upstream pub/sub event stream. As these are more of a global event now that we support multiple commands in the same container, it makes sense to move them to the more general event stream. This patch also remove the code in cmd waiting for container start or exit, making (temporarily) the cmd unable to report power metrics. We will fix that in a later commit. This patch fixes complicated issues we had with how a job running multiple commands in the container might not all wait for the end of the container: now none of them do.
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