test(nns): Add a benchmark for list neurons (#3076) #21451

Job	Run time
Bazel Build Fuzzers AFL	4m 16s
Bazel Build Fuzzers	2m 23s
Bazel Test All	39m 45s
Bazel Test macOS Intel	1h 23m 19s
Python CI Tests	1m 56s
Bazel Build All Config Check	0s
Build IC	16m 34s
Cargo Clippy Linux	23s
Cargo Build Release Linux	23s
Build Determinism (//publish/binaries:upload, release, build-ic/release, false)	33s
Build Determinism (//publish/canisters:upload, canisters, build-ic/canisters, false)	36s
Build Determinism (//ic-os/guestos/envs/prod:upload_disk-img, guest-os/update-img, build-ic/icos/...	31s
Build Determinism (//ic-os/hostos/envs/prod:upload_update-img, host-os/update-img, build-ic/icos/...	37s
Build Determinism (//ic-os/setupos/envs/prod:upload_disk-img, setup-os/disk-img, build-ic/icos/se...	36s
	2h 31m 52s

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