feat(sns): Print human-readable timestamps when printing timestamps for humans #21244

Job	Run time
Bazel Test All	27m 15s
Bazel Build Fuzzers	8m 36s
Bazel Build All Config Check	0s
Bazel Build Fuzzers AFL	5m 23s
Bazel Test macOS Intel	0s
Build IC	16m 46s
Cargo Clippy Linux	3m 52s
Cargo Build Release Linux	9m 56s
Python CI Tests	2m 5s
Build Determinism (//publish/binaries:upload, release, build-ic/release, false)	17s
Build Determinism (//publish/canisters:upload, canisters, build-ic/canisters, false)	12s
Build Determinism (//ic-os/guestos/envs/prod:upload_disk-img, guest-os/update-img, build-ic/icos/...	14s
Build Determinism (//ic-os/hostos/envs/prod:upload_update-img, host-os/update-img, build-ic/icos/...	17s
Build Determinism (//ic-os/setupos/envs/prod:upload_disk-img, setup-os/disk-img, build-ic/icos/se...	14s
	1h 15m 7s

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