Don't log import latency every time the task times out

[michaelkedar]

The workers log latency regardless of whether the task finished or not:

osv.dev/docker/worker/worker.py

Lines 623 to 628 in 01173bf

	done = done_event.wait(timeout=MAX_LEASE_DURATION)
	logging.info('Returned from task thread')
	self._log_task_latency(message)
	if not done:
	self.handle_timeout(subscriber, subscription, ack_id, message)
	logging.warning('Timed out processing task')

This messes with our import latency SLO monitoring, since jobs repeatedly get processed & timed out until it's processed correctly or dead-lettered.

We should also add a subscription to the dead letter topic to monitor failed imports

[github-actions]

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