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## Problem - QueryError always logged at error severity, even though disconnections are not true errors. - QueryError type is not expressive enough to distinguish actual errors from shutdowns. - In some functions we're returning Ok(()) on shutdown, in others we're returning an error ## Summary of changes - Add QueryError::Shutdown and use it in places we check for cancellation - Adopt consistent Result behavior: disconnects and shutdowns are always QueryError, not ok - Transform shutdown+disconnect errors to Ok(()) at the very top of the task that runs query handler - Use the postgres protocol error code for "admin shutdown" in responses to clients when we are shutting down. Closes: #5517