era-contracts repo has native support for validium already, so there is no need to use preprocessor.

Links for reference:

• https://github.com/matter-labs/era-contracts/blob/main/l1-contracts/contracts/zksync/Storage.sol#L172C15-L172C24
• https://github.com/matter-labs/era-contracts/blob/main/l1-contracts/contracts/zksync/Storage.sol#L90
• https://github.com/matter-labs/era-contracts/blob/main/l1-contracts/contracts/zksync/Storage.sol#L78

We also should get rid of the VALIDIUM_MODE mode env var in the zk tool, and era-contracts repo