Script to ghstack land

[pytorchbot]

This PR was created by the merge bot to help merge the original PR into the main branch.
ghstack PR number: #6340
^ Please use this as the source of truth for the PR number to reference in comments
ghstack PR base: https://github.com/pytorch/executorch/tree/gh/kirklandsign/18/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/kirklandsign/18/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/main
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/kirklandsign/18/orig

Original PR body:

    Stack from [ghstack](https://github.com/ezyang/ghstack) (oldest at bottom):

• Test my commit #6341
• -> Script to ghstack land #6340

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/6342

• 📄 Preview Python docs built from this PR

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

❌ 1 New Failure

As of commit 87c357c with merge base 7510f8c ():

NEW FAILURE - The following job has failed:

• Lint / lintrunner / linux-job (gh)
  >>> Lint for .github/scripts/propose_ghstack_orig_pr.py:

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