Arm Backend: Add tests for stack.default

[agrima1304]

Stack is not in the list of core ATen ops and is decomposed automatically when lowering the graph (https://docs.pytorch.org/docs/main/export.html#export-ir-decompositions), so only the tests need to be added.

stack is in this decomp table: https://github.com/pytorch/pytorch/blob/5d749ceb92c2c28bcfbdf918b4ab99b1a91fcb50/torch/_decomp/__init__.py#L466

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

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❌ 1 New Failure

As of commit d9f9aab with merge base f24351a ():

NEW FAILURE - The following job has failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 6805f3211385c399ca6017510b706d22e77d82d5d7c741ea6b5a6027659b4232 /exec failed with exit code 1

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[agrima1304]

@pytorchbot label "partner: arm"

[agrima1304]

@pytorchbot label "release notes: arm"

[agrima1304]

@pytorchbot label "ciflow/trunk"

[pytorch-bot]

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[digantdesai]

Thanks. Welcome to ET.

[zingo]

@agrima1304 there is a fail in an Arm test, it might be a flaky test and a re-run might help, if so and it turns green we can merge and ask in about it in our internal slack nd maybe create a ticket. Let me know if you dont know how to re-run the test and Ill show you.