ETRecord ser/de handling "None" outputs and more

[pytorchbot]

Summary:
For the ease of communication, let me assign nicknames to the files related to this diff:

• File A: caffe2/torch/_export/serde/serialize.py
• File B: executorch/exir/serde/serialize.py
• File C: executorch/exir/serde/export_serialize.py

Recently, we noticed that error torch._export.serde.serialize.SerializeError: Unable to deserialize output node Argument(as_none=[]) (P1210590561) was thrown from File B when deserializing ETRecord. It's possible that the error has been there since the beginning, but we've just never tested that logic path.

In this diff, I made a fix on File B to resolve this particular issue. Also adding handling for "None" output case in sdk logic. Keep on reading if you don't think the code changes make sense:

I explored the history of file changes. In chronological order:

1. D48258552, deserialize_graph_output() was copied from File A to File B, with some modifications made. The deserialize_graph_output() in File B overrides that in File A due to polymorphism.
2. D52446586, File C was created by copying File A. As a result of this diff, the deserialize_graph_output() in File B now overrides that in File C.
3. Also in D52446586, the deserialize_graph_output() in File A had some significant changes; File C got the new version of deserialize_graph_output(). But this diff didn't update the deserialize_graph_output() in File B.
4. D55391674 added the handling for "None" outputs to File A.

This diff brings (parts of) File C up-to-date with File A, and make deserialize_graph_output() in File B properly overrides that in File A.

In the future, we should figure out how to keep File C and File A in sync. Recently, File C was broken because it didn't stay in sync with File A in D54855251 and had to be fixed by D55776877.

Differential Revision: D56091104

[pytorch-bot]

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❌ 1 New Failure

As of commit 25b05c2 with merge base d3326a2 ():

NEW FAILURE - The following job has failed:

• pull / test-models-linux (cmake, llava_encoder, portable, linux.4xlarge, 90) / linux-job (gh)
  RuntimeError: Command docker exec -t cfb99031dcd5fe0fca4982881f5aa38cc5e81850e2df760e7a478c33d08a7738 /exec failed with exit code 1

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