Add possibility to filter equality tests based on RegExp

[kamilchodola]

Motivation

I want to run only specific subset of tests for example:

1. Compare Nethermind and Erigon where erigon does have trace_*
2. Compare Nethermind and Geth where geth do not have trace_* module.

This change allows me to split the runs for Geth and Erigon

Solution

Just simply give an opportunity to pass regexp patter to testname.
Works as usual for all and for specific test.
For pattern it looks like this:

PR Checklist

• Added Tests -> Not yet, if needed I can add them but I see for equality currently there is only one.
• Added Documentation -> Will add in next commit
• Breaking changes -> None