Implement test to show that EtheruemFeeProxy works with 0 fee

[MantisClone]

Problem

Reported by a hacker at ETHWarsaw.

Conclusion

EthereumFeeProxy DOES work with 0 fee according to https://github.com/pclaesen/RN_EthereumFeeProxy by @pclaesen

Definition of Done

• [x] Determine if true
• [ ] Re-implement Foundry tests from https://github.com/pclaesen/RN_EthereumFeeProxy using Hardhat in the https://github.com/RequestNetwork/requestNetwork repo

[MantisClone]

EthereumFeeProxy DOES work with 0 fee according to https://github.com/pclaesen/RN_EthereumFeeProxy by @pclaesen 👍

Thanks @pclaesen!

[benjlevesque]

At RequestFinance we use the ethereum fee proxy with 0 fees. See https://etherscan.io/tx/0x92a9bde4486bcc1b69e29df9ac42155062a76ac9da43a4e317a947e3f59b6a63.

[pclaesen]

Great!