bugfix(overridable): Prevent dangling pointer after removing override chain

[seer-by-sentry]

Fixes CLIENT-4DJ. The issue was that: Access violation in Overridable::getFinalOverride due to dereferencing a dangling m_nextOverride pointer in a corrupted override chain.

• Cleaned up the override chain before deleting an Overridable node.
• Resolved a potential dangling pointer issue when removeOverride() is called.
• Prevented access violations in getFinalOverride() due to prematurely freed m_nextOverride pointers.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 13529710

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