Fetch latest PR body during marketplace submission

[huntercaron]

Description

This pull request updates the auto-submit-on-merge flow so reruns fetch the latest pull request description inside scripts/submit-on-merge.ts, instead of relying on the cached event payload written by the workflow.

Changelog

• Marketplace auto-submit now resolves the latest PR body at runtime before extracting the changelog.
• The workflow now passes the PR number to the script and grants explicit PR read permission.

Testing

• yarn test:scripts
• yarn exec tsc --noEmit --pretty false --skipLibCheck --module ESNext --moduleResolution bundler --target ES2023 --lib ES2023,DOM,DOM.Iterable scripts/submit-on-merge.ts

[Copilot]

Pull request overview

Updates the marketplace auto-submit-on-merge flow to fetch the latest pull request body at runtime (rather than relying on the workflow event payload), ensuring reruns extract the current changelog.

Changes:

• Added runtime PR body resolution via GitHub REST API in scripts/submit-on-merge.ts (with file fallback).
• Converted the submit-on-merge runner to async to support awaiting the PR body fetch.
• Updated the workflow to pass PR_NUMBER and grant pull-requests: read permission (and explicit token permissions).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
scripts/submit-on-merge.ts	Fetches the latest PR body from GitHub API before extracting the changelog; updates execution flow to async.
.github/workflows/submit-on-merge.yml	Removes cached PR-body file writing, passes PR number to the script, and adds explicit token permissions for PR reads.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.