pub(crate) fn get_used_contracts(&self) -> Vec<U256> {
        self.state
            .decommittment_processor
            .decommitted_code_hashes
            .inner()
            .keys()
            .cloned()
            .collect()
    }
Returns the keys of contracts that are already loaded (known) by bootloader.
core/lib/multivm/src/versions/vm_m6/vm_instance.rs