feat: send a Slack notification when flow status is updated on production #5511

Job	Run time
Check file changes	6s
Run API Tests	2m 17s
E2E tests	10m 52s
Generate Hasura Change Summary	0s
Build React App	4m 20s
Run Integration tests	5m 23s
Run React Tests	6m 4s
Upsert Vultr Instance	5m 5s
Run Pulumi Preview	0s
Run Healthcheck on Pizza Services	35s
	34m 42s

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