Update Custom Remote Inference example to use RemoteModelHandler (#35066)

* Update Custom Remote Inference example to use RemoteModelHandler

* restore old kernel metadata

* Update examples/notebooks/beam-ml/custom_remote_inference.ipynb

Co-authored-by: Danny McCormick <dannymccormick@google.com>

* Add DLQ

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Co-authored-by: Danny McCormick <dannymccormick@google.com>

Author: jrmccluskey