[build Folder Migration] Move core build files into scripts

[jathu]

Summary

The final diff as part of #9117. This is the big one that affects users — we finally move the core build scripts into scripts/

Test plan

CI

cc @larryliu0820 @lucylq

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/9434

• 📄 Preview Python docs built from this PR

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❌ 2 New Failures, 1 Unrelated Failure

As of commit 20a572f with merge base 76ae537 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest-editable / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_check_quant_params.py::TestCheckQuantParams::test_inject_invalid_zp
• trunk / test-arm-reference-delegation / linux-job (gh)
  RuntimeError: Command docker exec -t a07730b79f8ce34845e5b25d3e4f3966d1d2cab8dd557c94ad25877990311776 /exec 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

• trunk / unittest-release / 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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[swolchok]

yep, this is a move. I would recommend importing just to make sure it works

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