[Infra] Enable, Document & Execute E2E Relay Load Testing on TestNet

[Olshansk]

Objective

Run a LoadTest on TestNet after TestNet Alpha #1 is launched.

Origin Document

• https://dev.poktroll.com/category/testing
• [Infra] Enable E2E Relay Load Testing on LocalNet #135
• [Load Testing] gherkin load test follow-up #521

Goals

• Run the first LoadTest on TestNet
• Prepare a process that can be repeated in the future
• Uncover any potential initial issues

Deliverables

• Document the process of how to run a load test on TestNet
• Document how to collect data or get visibility into TesNet
• Run an actual load test on TestNet
• Prepare a TestNet load test manifest

Non-goals / Non-deliverables

• Introduce new tooling
• Introduce new tests

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Creator: @Olshansk
Co-Owners: @okdas