[Testing] Fix the flaky panic: leveldb: closed test

[Olshansk]

Objective

Make unit tests in CI more reliable

Origin Document

An example of a failed CI run that only modified documentation: https://github.com/pokt-network/poktroll/actions/runs/10746831666/job/29808368953?pr=801

Goals

• Remove flaky tests
• Increase developer productivity (remove context switching)

Deliverables

• Identify and fix the panic: leveldb: closed test

Non-goals / Non-deliverables

• Tackling anything that's covered by [Testing] E2E Test Refactoring #799
• Refactoring or cleaning gup existing tests

General deliverables

• Comments: Add/update TODOs and comments alongside the source code so it is easier to follow.
• Testing: Add new tests (unit and/or E2E) to the test suite.
• Makefile: Add new targets to the Makefile to make the new functionality easier to use.
• Documentation: Update architectural or development READMEs; use mermaid diagrams where appropriate.

---

Creator: @Olshansk
Co-Owners: @bryanchriswhite