chore: Rename TestCWE to TestCompareKey

What does this MR do?

• Renames test to more closely describe behavior
• Add note in RULES.md about eslint rule sourcing

What are the relevant issue numbers?

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated for this project, if necessary
• Tests added for this feature/bug

Closes #129 Closes #130