GH-77143
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Validate extension JSON: Error: Hash changed for 'classes/WorkerThreadPool/methods/wait_for_task_completion', from 4CAD1009 to 32573865. This means that the function has changed and no compatibility function was provided.
Validate extension JSON: JSON file: Field was added in a way that breaks compatibility 'classes/WorkerThreadPool/methods/wait_for_task_completion': return_value

Changed the return value from `void` to `Error`. No adjustments should be necessary.
