delete qnnpack backend

[JacobSzwejbka]

Summary: Afaik this is unused and not maintained

Reviewed By: larryliu0820

Differential Revision: D83448512

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14663

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❌ 3 New Failures, 6 Cancelled Jobs, 2 Unrelated Failures

As of commit f2fe72a with merge base 9e6ad61 ():

NEW FAILURES - The following jobs have failed:

• Build Presets / windows (pybind) / build (gh)
• pull / test-llama-lora-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 7ec55973931319da5ad2dc581b2e952dbe27c2522d1fb062235adff621e177e3 /exec failed with exit code 1
• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t e4883769cdfc26886470671d4fcaf1f687046e879df79889ab10aeb3133116f8 /exec failed with exit code 1

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• periodic / test-models-linux (buck2, mv3, portable, linux.2xlarge, 90) / linux-job (gh)
• periodic / test-models-linux (buck2, mv3, xnnpack-quantization-delegation, linux.2xlarge, 90) / linux-job (gh)
• periodic / test-models-linux (cmake, mv3, portable, linux.2xlarge, 90) / linux-job (gh)
• periodic / test-models-linux (cmake, mv3, xnnpack-quantization-delegation, linux.2xlarge, 90) / linux-job (gh)
• periodic / test-models-linux (cmake, vit, portable, linux.2xlarge, 90) / linux-job (gh)
• periodic / test-models-linux (cmake, vit, xnnpack-quantization-delegation, linux.2xlarge, 90) / linux-job (gh)

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-binary-size-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-setup-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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[facebook-github-bot]

@JacobSzwejbka has exported this pull request. If you are a Meta employee, you can view the originating diff in D83448512.

[larryliu0820]

Review automatically exported from Phabricator review in Meta.

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[cccclai]

why are we deleting this? also can we at least move the test internal? This is the only test covered two backends