Robustify path handling and prevent buffer overflows

[seer-by-sentry]

Fixes CLIENT-2A2. The issue was that: Truncated executable path during SetCurrentDirectory leads to __security_init_cookie calling GetFullPathNameW with invalid data, causing wcsnlen to read-access violate.

• Improved GetModuleFileName usage in WinMain to check for truncation and ensure valid paths before setting the current directory.
• Added buffer overflow checks when constructing user data directory paths in GlobalData.cpp (Generals).
• Ensured SHGetSpecialFolderPath results are valid and not truncated before use in GlobalData.cpp (GeneralsMD).
• Corrected GetModuleFileNameW truncation check in MiniDumper to use '>=' instead of '==' for more accurate buffer overflow detection.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 8439454

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