Remove Android ExecuTorch demo

[kirklandsign]

Moved to https://github.com/pytorch-labs/executorch-examples

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/9554

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❌ 1 New Failure, 1 Cancelled Job

As of commit 7d57001 with merge base 4399b23 ():

NEW FAILURE - The following job has failed:

• pull / unittest / macos / macos-job (gh)
  backends/xnnpack/test/passes/test_convert_to_linear.py::TestConvertToLinear::test_fp32_convert_to_linear

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

• pull / unittest-editable / macos / macos-job (gh)
  ##[error]The operation was canceled.

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