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For prefect slack notifications, do we need to setup a block? Or would configuring it through the notification panel be sufficient?

For additional context, just notification without a block was working fine for prefect version 2.3.1. But after upgrading to prefect 2.10.x, the notifications are failing with the error
`KeyError: "No class found for dispatch key 'Slack-Webhook' in registry for type 'Block'."`

Hello Malavika, yes, I believe the new process is as follows:
1. create a slack webhook block
2. create an automation to fire off a notification
3. pass in the block to the automation 

No I am not using cloud, its a self hosted server