Remove Android LlamaDemo

[pytorchbot]

Has her new home https://github.com/meta-pytorch/executorch-examples/tree/main/llm/android/LlamaDemo

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14548

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❌ 3 New Failures, 1 Pending

As of commit c229284 with merge base e0dda90 ():

NEW FAILURES - The following jobs have failed:

• pull / test-qnn-wheel-packages-linux (3.10) / linux-job (gh)
  RuntimeError: Command docker exec -t 6ac305817c82ebba3f96da8df290317694fb5666e102571f1231a9fdbde09b74 /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.11) / linux-job (gh)
  RuntimeError: Command docker exec -t 05fc1e3dcd9d181e30a677808716a33ccf7e5a15ce7dda6b89ff41ab4cf702d7 /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.12) / linux-job (gh)
  RuntimeError: Command docker exec -t 562668bf83b5637108bce0208ac703bd3ba586a907be60e4fafc28522a804c2f /exec failed with exit code 1

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[GregoryComer]

QNN failures are pre-existing and since resolved. Merging.