ci: keep release candidate in draft for tests before tag

[zimeg]

Changelog

N/A — no user-facing changes.

Summary

This pull request creates the release candidate PR as a draft so it can be manually marked ready for review when appropriate.

Preview

N/A

Testing

Verify the next release workflow run creates a draft PR instead of a ready-for-review PR.

Notes

N/A

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.69%. Comparing base (c693443) to head (683a663).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #567      +/-   ##
==========================================
+ Coverage   71.66%   71.69%   +0.02%     
==========================================
  Files         226      226              
  Lines       19115    19115              
==========================================
+ Hits        13699    13704       +5     
+ Misses       4209     4206       -3     
+ Partials     1207     1205       -2     

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[zimeg]

📸 Preview: #553!

[Copilot]

Pull request overview

This PR updates the GitHub Actions release workflow so that newly created release-candidate pull requests are opened as drafts, allowing maintainers to mark them “ready for review” manually when appropriate.

Changes:

• Add --draft to the gh pr create invocation used when creating a new release PR.

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