Fix alert creation bug related to the Slack integration (#1967) #2225

Job	Run time
units / 🧪 Unit Tests	12m 13s
typecheck / typecheck	4m 36s
publish-worker / build (coordinator)	1m 28s
publish-webapp / publish	3m 13s
publish-worker / build (docker-provider)	57s
publish-worker / build (kubernetes-provider)	46s
	23m 13s

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