Fix AttributeError: '_thread._local' object has no attribute 'callers' in ExecutorSafeguard #44240
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…s' in ExecutorSafeguard when executed in multithreaded environment
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When executing PythonOperators using our in-house StreamedOperator in a multi threaded way we discovered we have sometimes random failures due to "AttributeError: '_thread._local' object has no attribute 'callers' in ExecutorSafeguard" errors. This MR fixes this issue., unfortunately I couldn't write a test to reproduce it as this is a concurrency issue.
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