Removing public_key from types/src/validator_verifier.rs
Removing public_key from types/src/validator_verifier.rs

Closes: #4148
Approved by: davidiw

aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,libra/libra,libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core