Cherry-pick #11263 to 6.6: Stop waiting for signals on closed outleters #11489
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Cherry-pick of PR #11263 to 6.6 branch. Original message:
Outleters start a goroutine to handle the finalization of filebeat. If the
outleter is closed by other means the goroutine will be kept running
even if it has nothing to do, leaking goroutines.
Stop this goroutine if the outleter is closed.