Script to ghstack land

[kirklandsign]

Stack from 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/6340

• 📄 Preview Python docs built from this PR

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

❌ 2 New Failures

As of commit 438d3e6 with merge base 7510f8c ():

NEW FAILURES - The following jobs have failed:

• Lint / lintrunner / linux-job (gh)
  >>> Lint for .github/scripts/propose_ghstack_orig_pr.py:
• Propose to merge ghstack orig PRs to main / Try to create a PR with ghstack /orig branch (gh)
  github.GithubException.GithubException: 422 {"message": "Validation Failed", "errors": [{"resource": "PullRequest", "field": "head", "code": "invalid"}], "documentation_url": "https://docs.github.com/rest/pulls/pulls#create-a-pull-request", "status": "422"}

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