video_core: Improve texture cache memory management to prevent leaks

Implement several improvements to the texture cache memory management system
to address memory leaks that occur in memory-intensive games like TOTK
(Title ID 0100F2C0115B6000). These changes prevent the gradual memory
increase that eventually leads to crashes or undefined behavior.

Key improvements:
- Enhance garbage collection with more aggressive cleanup thresholds
- Add emergency resource cleanup for persistent high memory usage
- Improve DeleteImage to ensure proper resource deallocation
- Make DelayedDestructionRing thread-safe with proper mutex protection
- Track consecutive high-memory frames to detect potential leaks
- Add emergency cleanup mechanism for extreme memory pressure situations
- Use proper type casting in std::max to fix compilation errors

This should significantly improve stability during extended gameplay
sessions with memory-intensive titles.

Signed-off-by: Zephyron <zephyron@citron-emu.org>

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