Arm backend: Add INT16 support to rescale operation

[lucylq]

Differential Revision: D80513725

Pull Request resolved: #13802

#13802 (comment) failed to cp to main

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14301

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❌ 2 New Failures, 2 Unrelated Failures

As of commit 544f4f6 with merge base 957915f ():

NEW FAILURES - The following jobs have failed:

• pull / unittest-arm-backend-with-no-fvp (test_pytest_ops) / linux-job (gh)
  RuntimeError: Command docker exec -t e02515c87cf4dc3b9b1cc4e2adb138791a282747615e065913239b3a4bae8f1c /exec failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh)
  backends/xnnpack/test/recipes/test_xnnpack_recipes.py::TestXnnpackRecipes::test_int8_dynamic_quant_recipe

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

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

• pull / test-openvino-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest / macos / macos-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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