Remove all deprecated functions and model fields

This removes a littany of deprecated fields, including PREFECT_CLOUD_URL from settings (which is why it touched frontend stuff)

wait does this require db migrations @chrisguidry ?

I don't believe so, but maybe some of these fields are on client-side models that aren't marked deprecated? The output was very noisy but I see some complaints about providing extra fields from a client-side call to the server

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This pull request was closed because it has been stale for 14 days with no activity. If this pull request is important or you have more to add feel free to re-open it.