fix: don't GC manifests #11637

Job	Run time
Build MacOS	4m 42s
cargo-publish-dry-run	7m 12s
Build Ubuntu	6m 37s
Forest CLI checks	10m 27s
State migrations	4m 55s
Calibnet check	4m 33s
Calibnet eth mapping check	9m 17s
Snapshot export checks	11m 35s
Calibnet kademlia checks	3m 0s
Calibnet no discovery checks	2m 40s
Calibnet stateless mode check	6m 6s
Wallet tests	5m 45s
Bootstrap checks - Forest	4m 2s
Bootstrap checks - Lotus	4m 58s
Calibnet RPC checks	14m 18s
db-migration-checks	21m 27s
db-migration-checks-car-db	7m 31s
Devnet checks	5m 12s
Devnet Curio checks	5m 2s
Calibnet snapshot parity checks	0s
	2h 19m 19s

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