TechDebt: TaskContext.TaskChannel is never closed #448
Description
taskrunner.NewTaskContext creates a new TaskChannel, but never closes it.
The tests don't seem to care, but it means you can't listen on the TaskChannel until it is closed, including for tr := range taskContext.TaskChannel() {, which makes usage of the TaskChannel need some other mechanism to stop listening.
In general, the function or goroutine that sends or manages sending things to the channel should close it as a signal that no more will be sent. This implies that the TaskRunner should close the TaskChannel, since it manages the tasks that send events to the shared channel.