Add release note label checker bot

[jackzhxng]

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[jackzhxng]

Stack from ghstack (oldest at bottom):

• -> Add release note label checker bot #6930

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/6930

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• [DomainsOnly] Jobs fail with GLIBC version not found

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As of commit 0e4ebff with merge base 3784f06 ():

NEW FAILURE - The following job has failed:

• Check Labels / Check labels (gh)
  # This PR needs a release notes: label

This comment was automatically generated by Dr. CI and updates every 15 minutes.

[github-actions]

This PR needs a release notes: label

If your changes are user facing and intended to be a part of release notes, please use a label starting with release notes:.

If not, please add the topic: not user facing label.

To add a label, you can comment to pytorchbot, for example
@pytorchbot label "topic: not user facing"

For more information, see
https://github.com/pytorch/pytorch/wiki/PyTorch-AutoLabel-Bot#why-categorize-for-release-notes-and-how-does-it-work.