feat(sns): Print human-readable timestamps when printing timestamps f… #21246

Job	Run time
Bazel Test macOS Intel	54m 32s
Bazel Build Fuzzers AFL	28m 33s
Bazel Test All	31m 53s
Bazel Build All Config Check	0s
Bazel Build Fuzzers	3m 11s
Build IC	20m 45s
Cargo Clippy Linux	22s
Cargo Build Release Linux	22s
Python CI Tests	2m 45s
Build Determinism (//publish/binaries:upload, release, build-ic/release, false)	40s
Build Determinism (//publish/canisters:upload, canisters, build-ic/canisters, false)	31s
Build Determinism (//ic-os/guestos/envs/prod:upload_disk-img, guest-os/update-img, build-ic/icos/...	39s
Build Determinism (//ic-os/hostos/envs/prod:upload_update-img, host-os/update-img, build-ic/icos/...	40s
Build Determinism (//ic-os/setupos/envs/prod:upload_disk-img, setup-os/disk-img, build-ic/icos/se...	49s
	2h 25m 42s

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