perf(mutex): Optimize CriticalSectionClass by inlining CRITICAL_SECTION storage

[seer-by-sentry]

Fixes CLIENT-1ES. The issue was that: Heap corruption from _aligned_free on non-_aligned_malloc memory for CriticalSectionClass instances, causing RtlLeaveCriticalSection crash.

• Changed CriticalSectionClass to use inline storage for CRITICAL_SECTION objects.
• Eliminated heap allocation and deallocation for critical sections, improving performance and reducing memory overhead.
• Ensured proper alignment for the inline CRITICAL_SECTION storage.

This fix was generated by Seer in Sentry, triggered by x64-dev. 👁️ Run ID: 13885643

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