Remove unused shim

[kirklandsign]

We will remove unused shim and un-sync from common shim for now

We will deprecate OSS BUCK build later

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/4597

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❌ 1 Cancelled Job, 2 Unrelated Failures

As of commit db8d940 with merge base 2718dd4 ():

CANCELLED JOB - The following job was cancelled. Please retry:

• trunk / test-models-macos (cmake, resnet50, portable, macos-m1-stable, 90) / macos-job (gh)
  ##[error]The operation was canceled.

UNSTABLE - The following jobs failed but were likely due to flakiness present on trunk and has been marked as unstable:

• Build Linux Wheels / pytorch/executorch / upload / manywheel-py3_9-cpu (gh) (#4308)
  Unable to find an artifact with the name: pytorch_executorch__3.9_cpu_x86_64
• Build M1 Wheels / pytorch/executorch / upload / wheel-py3_9-cpu (gh) (#4309)
  Unable to find an artifact with the name: pytorch_executorch__3.9_cpu_

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