feat(nns): Split the active_neurons_in_stable_memory into 2 flags (#3… #644

Job	Run time
Bazel System Test Staging	6m 16s
Bazel System Test Nightly	21m 58s
Bazel System Test Hotfix	8m 23s
Dependency Scan for Release	25m 51s
Setting up guest os qualification pipeline	8s
CI Main / Bazel Build All Config Check	0s
CI Main / Bazel Build Fuzzers AFL	8m 48s
CI Main / Bazel Build Fuzzers	2m 44s
CI Main / Bazel Test All	14m 23s
CI Main / Bazel Test macOS Intel	47m 12s
CI Main / Build IC	16m 41s
CI Main / Cargo Build Release Linux	25s
CI Main / Cargo Clippy Linux	22s
CI Main / Python CI Tests	2m 11s
Qualifying 76a634c31dfb840da25fbe286855eb0be1818ca8 -> a726b717424549961f46b26132a1391132a95929	1h 28m 47s
CI Main / Build Determinism (//publish/binaries:upload, release, build-ic/release, false)	37s
CI Main / Build Determinism (//publish/canisters:upload, canisters, build-ic/canisters, false)	1m 23s
CI Main / Build Determinism (//ic-os/guestos/envs/prod:upload_disk-img, guest-os/update-img, build-ic/icos/...	41s
CI Main / Build Determinism (//ic-os/hostos/envs/prod:upload_update-img, host-os/update-img, build-ic/icos/...	1m 8s
CI Main / Build Determinism (//ic-os/setupos/envs/prod:upload_disk-img, setup-os/disk-img, build-ic/icos/se...	40s
	4h 8m 38s

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