Make a real buck file for Apple extension to run tests

[shoumikhin]

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[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/9566

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❌ 1 New Failure, 2 Unrelated Failures

As of commit 34df556 with merge base c890809 ():

NEW FAILURE - The following job has failed:

• pull / unittest-buck / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 3

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

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[shoumikhin]

@pytorchbot label "topic: not user facing"