Explain "spring.cloud.task.closecontext-enabled" in an FAQ

[sabbyanandan]

As a user, I'm trying to re-run a task (as well, via CTR); however, I notice that even after the task-run is complete, I still do not get a clean exit-signal. The task-execution continues to state that it is running, which creates a downstream bottleneck for when there's a concurrent-task-launch limit is set.

Let's capture spring.cloud.task.closecontext-enabled in an FAQ. Specifically, also, let's capture the steps to clean-up the context when the Task is a batch-job. (see: spring-cloud/spring-cloud-dataflow#3444 (comment))