Reduce contention on batchTaskRun when setting expected count (#1662) #2008

Job	Run time
units / 🧪 Unit Tests	1m 56s
typecheck / typecheck	3m 27s
publish-worker / build (coordinator)	1m 34s
publish-webapp / publish	3m 23s
publish-worker / build (docker-provider)	56s
publish-worker / build (kubernetes-provider)	39s
	11m 55s

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