ci: update comment

[asukaminato0721]

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Summary

no more comments

Screenshots

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Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran make lint && make type-check (backend) and cd web && pnpm exec vp staged (frontend) to appease the lint gods

[Copilot]

Pull request overview

Updates the Pyrefly diff GitHub Actions workflows to avoid spamming pull requests with repeated “Pyrefly Diff” comments by updating an existing comment instead of always creating a new one.

Changes:

• Add logic to find an existing “Pyrefly Diff” PR comment and update it if present.
• Fall back to creating a new comment when no existing comment is found.
• Apply the same update-or-create behavior to both the in-PR workflow and the workflow_run comment workflow.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

File	Description
.github/workflows/pyrefly-diff.yml	Switch PR commenting from always-create to update-or-create based on an existing marker comment.
.github/workflows/pyrefly-diff-comment.yml	Apply the same update-or-create behavior when commenting from workflow_run (fork PRs).

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