SLVS-2465 Add analysis engine to connect with Roslyn APIs

[georgii-borovinskikh-sonarsource]

SLVS-2465

Part of

[sonarqubecloud]

🤖 Pull Request summary

Updates baseline files and adds comprehensive unit tests for Roslyn analyzer engine.

Main Changes:
• Updates assembly reference baseline files with additional dependencies (Microsoft.CodeAnalysis, Microsoft.VisualStudio.LanguageServices, etc.)
• Adds 276-line unit test file for SequentialSonarRoslynAnalysisEngineTests with comprehensive test coverage
• Includes MEF export verification, singleton pattern validation, and analysis workflow testing
• Updates project dependencies and configurations to support the new testing infrastructure

Key Areas for Review:

• The test coverage appears thorough but verify the mock setup accurately reflects real Roslyn analyzer behavior
• Assembly baseline changes show significant dependency additions - ensure these don't introduce version conflicts
• Test methods using complex mock chains should be validated for correctness of the underlying analysis workflow

💬 Please send your feedback

Quality Gate failed

Failed conditions
15 New issues
32.6% Coverage on New Code (required ≥ 85%)

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