add TORCHDYNAMO_CAPTURE_DYNAMIC_OUTPUT_SHAPE_OPS

[dshi7]

tlparse prints failure description like this

dynamic shape operator: aten._unique2.default; to enable, set torch._dynamo.config.capture_dynamic_output_shape_ops = True

adding os env var to set it easier for testing

cc @voznesenskym @penguinwu @EikanWang @jgong5 @Guobing-Chen @XiaobingSuper @zhuhaozhe @blzheng @wenzhe-nrv @jiayisunx @chenyang78 @kadeng @chauhang

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[dshi7]

@pytorchbot rebase

[pytorchmergebot]

@pytorchbot started a rebase job onto refs/remotes/origin/viable/strict. Check the current status here

[pytorchmergebot]

Successfully rebased add_new_env onto refs/remotes/origin/viable/strict, please pull locally before adding more changes (for example, via git checkout add_new_env && git pull --rebase)

[dshi7]

@pytorchbot merge

[pytorchmergebot]

Merge failed

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[dshi7]

@pytorchbot label "release notes: python_frontend"

[dshi7]

@pytorchbot merge

[pytorchmergebot]

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