fix: resolve SonarCloud quality gate violations

[rockygeekz]

Summary

• Add placeholder test to empty test fixture file (S2187)
• Separate host lookup from exception-throwing call so pytest.raises block has a single throwable invocation (S5778)
• Remove unused mkdocstrings plugin that fetches objects.inv from docs.ansible.com, causing intermittent HTTP 429 failures in strict mode (same fix as ansible-lint#5084)

Test plan

• Existing tests pass
• Docs build no longer fails on objects.inv 429
• SonarCloud quality gate should turn green after merge

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Enterprise

Run ID: 5d184f7d-59ab-479d-bf97-2b9b25ff6556

📥 Commits

Reviewing files that changed from the base of the PR and between 4879a35 and b730d3f.

📒 Files selected for processing (3)

• mkdocs.yml
• tests/fixtures/ansible_collections/test/test/tests/unit/plugins/modules/test_pool.py
• tests/test_module_dispatcher.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/sonarcloud-issues

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