refactor: use 4 val nodes for e2e tests

[seantking]

Description

Using 4 validator nodes instead of 1 for e2e tests.

closes: #XXXX

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• Wrote unit and integration tests
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• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer
• Review Codecov Report in the comment section below once CI passes

[chatton]

LGTM once they all pass 🥇

[seantking]

Interested to see if the tests take much longer to run

[seantking]

Seems like the tests are failing with some network issues.

[colin-axner]

🙌