🧪 Add error test for try-catch in AmbientBiotaDirector

[marko1olo]

🎯 What: Addressed the missing error test for the try-finally block where NativeFaultDumpWriter.CreateTransientPayload is called inside AmbientBiotaDirector.TryWriteBlackBoxSnapshotCold().
📊 Coverage: Added AmbientBiotaDirectorExceptionEditTests.cs to test the scenario where a NullReferenceException is artificially forced, confirming that the transient payload correctly disposes via the finally block even when an exception interrupts the payload population.
✨ Result: Ensured that transient native collections do not leak memory during a fault dump write failure, which is important for system robustness.

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PR created automatically by Jules for task 2811566199377692493 started by @marko1olo

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