Add comprehensive test result samples documentation

[joostboon]

Document all controls for test result sample rows across dbt-data-reliability and Elementary Cloud, including global and per-test settings, PII protection, and environment-level controls managed by the Elementary team.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch test-result-samples-docs

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