NIFI-12340: Only call PythonBridge.onProcessorRemoved for python base…

[markap14]

…d processors, not all processors. Do so in a background virtual thread. Also specified explicit versions for openai dependencies to ensure correctness, since the newly released 1.x is not yet compatible with the latest langchain

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NIFI-00000

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[exceptionfactory]

Thanks for the improvement @markap14, avoiding the call to onProcessorRemoved for non-Python components is helpful, and setting a specific version of the Python dependencies also looks good. +1 merging