[P2P] [Testing] Refactor module-level P2P tests

[bryanchriswhite]

Objective

Improve the quality and utility of the module-level tests, starting with P2P.

Origin Document

Goals

• Reconsider module-level test objectives
• Restore quality to module-level P2P tests

Deliverable

• Update appropriate documentation regarding module-level test objectives & examples
• Refactor module-level P2P tests accordingly
• Identify any outstanding similar TECHDEBT other modules' module-level tests

Non-goals / Non-deliverables

• Refactoring unit or E2E tests
• Refactoring module-level tests in other modules (this issue is focused on P2P)

General issue deliverables

• Update the appropriate CHANGELOG(s)
• Update any relevant local/global README(s)
• Update relevant source code tree explanations
• Add or update any relevant or supporting mermaid diagrams

Testing Methodology

• All tests: make test_all
• LocalNet: verify a LocalNet is still functioning correctly by following the instructions at docs/development/README.md
• k8s LocalNet: verify a k8s LocalNet is still functioning correctly by following the instructions here

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Creator: @bryanchriswhite
Co-Owners: @Olshansk