chore(auth): quiet policy evaluator test diagnostics

[yordis]

• Keep authorization tests aligned with current analyzer guidance.
• Reduce low-value diagnostics around policy evaluator coverage.

[cursor]

PR Summary

Low Risk
Low risk: test-only refactor that switches to index-from-end access and makes helpers static, with no production code changes.

Overview
Updates MultiPolicyEvaluatorTests to reduce diagnostic/analyzer noise by making CreateSut/CreatePolicy static and replacing result.Matches.Last() with result.Matches[^1] when asserting on the final match.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: c5aca0ae-8e30-4453-b31f-db8a017fd2f8

📥 Commits

Reviewing files that changed from the base of the PR and between 92e4a69 and afe7c00.

📒 Files selected for processing (1)

• src/EventStore.Core.XUnit.Tests/Authorization/MultiPolicyEvaluatorTests.cs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch yordis/chore-auth-test-analyzers

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