WallectConnect - Tx failure warning always shows when you try to sign

[francovenica]

Env and safe:
https://pr1771--safereact.review.gnosisdev.com/rinkeby/app/#/safes/0xfcBFa810e2578bB38d8874392a2237Db3b326389/transactions

Issue:
For on chain and off chain tx's. The warning will always show, even when the tx is trivial and is sure to be successful (like a send funds tx)

[Agupane]

I investigated the issue together with @dasanra and seems that the problem is that WalletConnect does not support eth_call or any read methods. One solution could be to use a hardcoded provider for the estimation given that there is a new issue (#212) that estimates the gas on the transaction service, I'm going to put this on hold to move to that implementation once it's ready