Arm backend: Only fetch what is used

[mansnils]

Additional patches are applied during download to remove projects that are not used.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/11853

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❌ 1 New Failure, 1 Unrelated Failure

As of commit cce8363 with merge base 695c7d5 ():

NEW FAILURE - The following job has failed:

• trunk / test-models-macos (vit, xnnpack-quantization-delegation) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Apple / build-benchmark-app / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 65

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