Fix TurretAI crash during state machine destruction

[seer-by-sentry]

Fixes CLIENT-44Q. The issue was that: AIUpdateInterface destructor crashes accessing freed memory because m_ai is a cached raw pointer to a module deleted prematurely.

• Halt the turret state machine before deletion.
• Prevents crashes caused by onExit() accessing a nulled AI interface during state machine destruction.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 12186899

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[github-actions]

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