fix: avoid shell interpretation of PR body in CI workflows

[tangcent]

Summary

Fix CI workflow failures caused by special characters (backticks, single quotes, etc.) in PR body text being interpreted as shell commands.

Problem

Both pr-package.yml and pr-close-issue.yml used direct GitHub Actions template substitution inside shell scripts:

echo '${{ github.event.pull_request.body }}'

This causes the PR body content to be injected directly into the shell script, where backticks are interpreted as command substitution and single quotes break quoting. This led to CI failures like:

NoSuchClassError: command not found
syntax error: unexpected end of file

Fix

Pass the PR body as an environment variable and use printf to write it safely:

env:
  PR_BODY: ${{ github.event.pull_request.body }}
run: |
  printf '%s' "$PR_BODY" > pr_body.txt

This avoids any shell interpretation of the PR body content.

[github-actions]

📦 Plugin has been packaged for this PR. You can download easy-yapi-2.8.4.212.0.zip from the GitHub Actions workflow run by clicking on the "Artifacts" dropdown.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.681%. Comparing base (640e35f) to head (bacc5df).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##              master     #1280   +/-   ##
===========================================
  Coverage     54.681%   54.681%           
  Complexity      2748      2748           
===========================================
  Files            289       289           
  Lines          15329     15329           
  Branches        3714      3714           
===========================================
  Hits            8382      8382           
  Misses          5245      5245           
  Partials        1702      1702           

Flag	Coverage Δ
unittests	54.681% <ø> (ø)

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