🧹 refactor(testutil): extract duplicate assertStatus helper

[jackby03]

🧹 Extract duplicate assertStatus test helper function across module test files into internal/modules/util/testutil.

🎯 What: Extracted duplicate assertStatus function definitions from module test files (mac, auditd, containers, crypto, firewall, logging, network, ntp, ssh, updates, users) into testutil.AssertStatus in package internal/modules/util/testutil.

💡 Why: Reduces code duplication across unit tests and simplifies maintainability when updating finding assertion behavior.

✅ Verification: Added unit tests in internal/modules/util/testutil/testutil_test.go and verified all tests across internal/modules/... pass.

✨ Result: Cleaned up duplicate code across 11 test files and centralized test finding assertions in a shared package.

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PR created automatically by Jules for task 17582178743756889352 started by @jackby03

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