refactor: deduplicate common code in unit test lint rules

[dyc3]

Summary

The goal was to simplify the implementations of these rules, and avoid allocating Vecs when just iterating over unit test functions.

Test Plan

snapshots

Docs

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Latest commit: e1cbcb9

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[dyc3]

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This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• refactor: deduplicate common code in unit test lint rules #9395 👈 (View in Graphite)
• feat(lint/js): add useTestHooksInOrder #9394
• feat(lint/js): add useTestHooksOnTop #9393
• feat(lint/js): add noIdenticalTestTitle #9376
• main

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