Removed duplicated L2 election test code

### Description

Using test contract inheritance to minimize duplicated code during L2 testing

### Other changes

removed unused var

### Tested

unit tested

### Related issues

- Fixes #[issue number here]

### Backwards compatibility

_Brief explanation of why these changes are/are not backwards compatible._

### Documentation

_The set of community facing docs that have been added/modified because of this change_