Unify code-style in tests

[StepanShimigonov]

Brought the code to a unified style, removed the commented-out remaining code

Description

Unify code-style and remove commented code

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Rationale

Code-style

How Has This Been Tested?

CI/CD in repo, this do not provide additional tests

---

This PR contains:
- Refactor of zkevm-circuits/aggregator/src/tests.rs

Design choices

Basic code-style