fix the decomposition of aten.threshold

[alanhe151220037]

Fixes #118642
fix the decomposition of aten.threshold to make its output consistent with eager mode when input tensor is intergral and threshold is a negative float.

[pytorch-bot]

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❌ 2 New Failures, 1 Unrelated Failure

As of commit 95d6204 with merge base c76a9d1 ():

NEW FAILURES - The following jobs have failed:

• Lint / lintrunner-noclang / linux-job (gh)
  >>> Lint for torch/distributed/_tools/mod_tracker.py:
• Lint / workflow-checks / linux-job (gh)
  ##[error]The operation was canceled.

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / linux-focal-py3_8-clang9-xla / test (xla, 1, 1, linux.12xlarge) (gh) (trunk failure)
  test_repeat_truncated

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[alanhe151220037]

@mlazos Do the workflows require some approval ？

[eellison]

looks good - mind adding a test ? you can add it in test_decomp

[alanhe151220037]

looks good - mind adding a test ? you can add it in test_decomp

of course, I have added the test case here and it will be run in test_comprehensive_nn_functional_threshold_*.

https://github.com/pytorch/pytorch/blob/95d620481cd6322d36d30fdaec7b687d7e4ff1c6/torch/testing/_internal/common_methods_invocations.py#L3356-L3358