Unbreaking testnet4

The email from Sjors Provoost to the Bitcoin Development Mailing List highlights a significant suggestion regarding the testnet4. The core of this suggestion revolves around the mining of non-standard, yet consensus-valid transactions. It points out that these types of transactions can effectively be processed as long as there exists at least one miner willing to accept and mine them. Furthermore, the proposal suggests that these transactions could be more efficiently managed through a public interface equipped with DoS (Denial of Service) protection measures. This approach would facilitate the handling of such transactions, ensuring their viability and integration within the testnet4 environment.