improve stacks of cancels from defers #4905

Job	Run time
prepare	1s
test / prepare	2m 23s
test / run (containerd, ./frontend/dockerfile, integration)	4m 43s
test / run (containerd, ./frontend/dockerfile, dockerfile)	6m 42s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	4m 44s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	6m 36s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	5m 20s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	6m 55s
test / run (containerd-1.7, ./frontend/dockerfile, integration)	5m 17s
test / run (containerd-1.7, ./frontend/dockerfile, dockerfile)	6m 49s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	5m 58s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	7m 26s
test / run (oci, ./frontend/dockerfile, integration)	4m 24s
test / run (oci, ./frontend/dockerfile, dockerfile)	5m 42s
test / run (oci-rootless, ./frontend/dockerfile, integration)	4m 25s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	6m 30s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, integration)	4m 58s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, dockerfile)	6m 28s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	4m 34s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	6m 20s
image (mainline)	5m 28s
image (labs)	5m 43s
scout	0s
release	0s
	1h 57m 26s

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