Don't use git to get the repo root

[jathu]

Summary

When using tools like Sapling or Jujutsu, these scripts will fail since the .git dir does not exist.

rg "git rev-parse --show-toplevel" --hidden

Test plan

CI

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/11377

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 9 New Failures, 48 Pending, 1 Unrelated Failure

As of commit 45c42a4 with merge base 911fb0b ():

NEW FAILURES - The following jobs have failed:

• Apple / build-benchmark-app / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• Apple / build-frameworks-ios / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• Build macOS Wheels / pytorch/executorch / build-wheel-py3_10-cpu (gh)
  Process completed with exit code 1.
• Build macOS Wheels / pytorch/executorch / build-wheel-py3_11-cpu (gh)
  Process completed with exit code 1.
• Build macOS Wheels / pytorch/executorch / build-wheel-py3_12-cpu (gh)
  Process completed with exit code 1.
• Build macOS Wheels / pytorch/executorch / upload / upload-wheel-py3_11-cpu (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.11_cpu_
• Build macOS Wheels / pytorch/executorch / upload / upload-wheel-py3_12-cpu (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.12_cpu_
• pull / unittest-editable / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_floor.py::TestFloor::test_fp16_floor
• trunk / test-coreml-delegate / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• Build macOS Wheels / pytorch/executorch / upload / upload-wheel-py3_10-cpu (gh) (detected as infra flaky with no log or failing log classifier)

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