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In #5454 I had to make a fairly unappealing test as I needed a connector to be able to use the column stream.
Additionally we had some unresolved uglyness around LongRunningConnection/commandscope after doing #5123.
So after we recently discussed improving localized recovery in #5440 I decided it was time for me to understand the cancellation mechanisms in place more deeply and improve separation.
This is one step towards recovering from timeouts/OCEs in a more localized fashion as all control is now situated in the connector. Future work would be to allow Cancel to withhold breaking the connection and instead just cancel the current operation.