fix(chain-listener): reset proof counters on new epoch in refresh [NET-813]

[justprosh]

Description

Clear proof counters in case of epoch change inside refresh method.

Motivation

Otherwise, in case of websocket disconnect and epoch change peer won't reset proof counters and won't send any proofs.

Checklist

• The code follows the project's coding conventions and style guidelines.
• All tests related to the changes have passed successfully.
• Documentation has been updated to reflect the changes (if applicable).
• All new and existing unit tests have passed.
• I have self-reviewed my code and ensured its quality.
• I have added/updated necessary comments to aid understanding.

Reviewer Checklist

• Code has been reviewed for quality and adherence to guidelines.
• Tests have been reviewed and are sufficient to validate the changes.
• Documentation has been reviewed and is up to date.
• Any questions or concerns have been addressed.

[linear]

NET-813 Clean up proof_counter on every epoch change