The connection.connect function wraps the supplied context using context.WithCancel and stores the returned cancellation function so we can abort connection establishment. We need to ensure we call that function in a defer after connect finishes and also set it to nil because the cancellation function holds a reference to the context, which pins all of the memory that the context has stored.

This will require a mutex for syncrhonization because the cancellation function is accessed by both the connect and closeConnectContext functions.