vm.snapshot cannot be called subsequently after restoring to earlier history (not persisted)

[0xalpharush]

The implementation of vm.snapshot uses go-ethereum's revertToSnapshot which will delete "future" states after reverting e.g. a history of [1,2,3] will become [1] if revertToSnapshot(1) is called so it's not possible to call revertToSnapshot(3) following. This deviates from how Foundry's implementation works (see foundry-rs/foundry#5487).