fix: don't clobber attached runtime's cancel in RunSession/recallSession #7684

Job	Run time
build-and-test	4m 44s
build-image (linux/amd64, ubuntu-latest)	5m 13s
lint	3m 25s
build-image (linux/arm64, ubuntu-24.04-arm)	4m 18s
license-check	54s
build-and-push-image	0s
merge-and-push-template	0s
merge-and-push-image	0s
	18m 34s

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