util/system: deprecate Atime implementation for containerd/continuity/fs #4856

Job	Run time
prepare	1s
test / prepare	2m 6s
test / run (containerd, ./frontend/dockerfile, integration)	5m 12s
test / run (containerd, ./frontend/dockerfile, dockerfile)	7m 26s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	4m 55s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	7m 30s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	5m 1s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	6m 58s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	5m 43s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	8m 23s
test / run (oci, ./frontend/dockerfile, integration)	4m 49s
test / run (oci, ./frontend/dockerfile, dockerfile)	6m 2s
test / run (oci-rootless, ./frontend/dockerfile, integration)	4m 27s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	5m 44s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, integration)	4m 35s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, dockerfile)	5m 45s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	4m 31s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	6m 5s
image (mainline)	5m 38s
image (labs)	5m 28s
scout	0s
release	0s
	1h 46m 19s

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