Limit disk storage state update only to execute_block calls.

[Zurcusa]

As per spec Fruzhin must not update the disk state storage when validating a transaction. When validating a transaction the runtime calls a bunch of host api functions related to updating the storage. That is only for it to check if the transaction is valid or not. The changes made should not be persisted in the disk storage. Disk updates are reserved only for Core_execute_block