Revert 16A8W ops test update for slice

[Ninja91]

Summary:
This reverts the changes from D84262200 which removed xfails from tests for 16A8W operations (Slice, Cat, Add, Mul, View, Transpose). After landing, these tests are failing in GitHub CI.

Failed test: https://github.com/pytorch/executorch/actions/runs/18439599594/job/52538228881
Differential Revision: D84564694

cc @freddan80 @per @zingo @oscarandersson8218 @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15088

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❗ 1 Active SEVs

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• [ROCm][CI] Machines under the label linux.rocm.gpu.2 are undergoing maintenance.

❌ 3 New Failures, 37 Pending, 3 Unrelated Failures

As of commit 72660be with merge base 50f96a0 ():

NEW FAILURES - The following jobs have failed:

• Lint / android-java-format / linux-job (gh)
  RuntimeError: Command docker exec -t a256c6da10291a1dad41ea291bf5eb8b31fe40256f154b29f23f1390345f7807 /exec failed with exit code 1
• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 769ce59df9b157cb6622f377d151ed71a85865d46bad0da61c8fe9e523d4b378 /exec failed with exit code 1
• Test CUDA Builds / export-voxtral-cuda-artifact / linux-job (gh)
  RuntimeError: Command docker exec -t a05a0d71e70ff79758ce44bff0093ffbfa43432a32cb9b3d023042e285a7eee9 /exec failed with exit code 2

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

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

• pull / unittest / windows / windows-job (gh) (trunk failure)
  runtime/test/test_runtime_etdump_gen.py::RuntimeETDumpGenTest::test_etdump_params_with_bytes_and_buffer
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  runtime/test/test_runtime_etdump_gen.py::RuntimeETDumpGenTest::test_etdump_params_with_bytes_and_buffer
• trunk / unittest-release / windows / windows-job (gh) (trunk failure)
  runtime/test/test_runtime_etdump_gen.py::RuntimeETDumpGenTest::test_etdump_params_with_bytes_and_buffer

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[meta-codesync]

@Ninja91 has exported this pull request. If you are a Meta employee, you can view the originating Diff in D84564694.

[zingo]

MacOS fails unrelated