refactor(sns): Add helpers for the upgrade journal #17789

Job	Run time
Bazel Build All Config Check	0s
Bazel Build All Config Check	0s
Bazel Build Fuzzers	2m 57s
Bazel Build Fuzzers	2m 57s
Bazel Build Fuzzers AFL	4m 52s
Bazel Build Fuzzers AFL	4m 52s
Bazel Test All	31m 25s
Bazel Test All	10m 39s
Bazel Test macOS Intel	0s
Bazel Test macOS Intel	0s
Build IC	1s
Build IC	22m 21s
Cargo Build Release Linux	1s
Cargo Build Release Linux	23m 53s
Cargo Clippy Linux	1s
Cargo Clippy Linux	8m 28s
Python CI Tests	1s
Python CI Tests	8m 33s
Build Determinism	1s
Build Determinism (//publish/binaries:upload, release, build-ic/release, false)	21s
Build Determinism (//publish/canisters:upload, canisters, build-ic/canisters, false)	14s
Build Determinism (//ic-os/guestos/envs/prod:upload_disk-img, guest-os/update-img, build-ic/icos/...	16s
Build Determinism (//ic-os/hostos/envs/prod:upload_update-img, host-os/update-img, build-ic/icos/...	13s
Build Determinism (//ic-os/setupos/envs/prod:upload_disk-img, setup-os/disk-img, build-ic/icos/se...	15s
	2h 2m 21s

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