Add RPC tests as part of upgrade test

[skosito]

Describe the Issue
After the recent upgrade, eth_getTransactionReceipt was not working properly for transactions before upgrade (from field was missing).

This shows that we need a way to test RPC endpoints after upgrade, both for new and old transactions. It can be pretty basic for start, just to check if required fields are returned, or maybe even to somehow compare result before upgrade with result after upgrade etc.

Expected Outcome
We have a way to test that upgrade won't break RPC endpoints.