fix(release-wporg): build release artifacts before uploading to WP.org

[dkoo]

All Submissions:

• Have you followed the Newspack Contributing guideline?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Instead of trying to fetch and download a release artifact built by a prior release job, just rebuilds the required artifact in the release-org job.

How to test the changes in this Pull Request:

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Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

[Copilot]

Pull request overview

This PR modifies the reusable WordPress.org release workflow to build release artifacts directly instead of downloading them from a prior release job. The change aims to simplify workflow coordination by eliminating the dependency on artifact upload/download between jobs.

Changes:

• Replaced actions/download-artifact@v4 step with npm run release:archive to build artifacts directly in the release-wporg job

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[github-actions]

🎉 This PR is included in version 5.9.3 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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