Better errors for missing access

[samstr]

If you try to connect and your service token is missing the connect_branch or connect_production_branch access you simply get a generic Http 404 error in the response. Not helpful. It would be nice to have more descriptive errors for things like this.

Apologies if this is the wrong place for feedback. I know it's more of a planetscale API issue rather than the planetscale-node client.