refactor: reusable WP.org release workflow

[rbcorrales]

The repos migrating from CircleCI to GitHub Actions that publish to WP.org had a release-wporg job that did a fresh checkout + npm ci but never built the release/ directory that release-wporg.sh expects.

In CircleCI, this worked via persist_to_workspace / attach_workspace. This PR tries to bridge that gap using upload-artifact / download-artifact:

• Adds reusable-release-wporg.yml, a reusable workflow for publishing to WordPress.org that downloads release artifacts from the release job and runs release-wporg.sh.
• Accepts an optional plugin-name input (defaults to the repository name) for repos where the WP.org slug differs.
• Includes a guard step that fails with a clear error if the expected release/<plugin-name> directory is missing. For the existing cases, the repo names should match, but this could become useful in the future.
• Adds retention-days: 1 to the release artifact upload in reusable-release.yml, since these artifacts are only needed as transitory glue between the release and WP.org release jobs within the same workflow run.

Consuming PRs:

• chore: use reusable WP.org release workflow newspack-newsletters#2021
• chore: use reusable WP.org release workflow super-cool-ad-inserter-plugin#237
• chore: use reusable WP.org release workflow republication-tracker-tool#298

[Copilot]

Pull request overview

This PR introduces a reusable workflow for publishing WordPress plugins to WordPress.org, adapting the previous CircleCI workspace-based approach to GitHub Actions' artifact system.

Changes:

• Adds artifact upload to the release workflow with 1-day retention for transient inter-job communication
• Creates a new reusable WordPress.org release workflow that downloads release artifacts and executes the publishing script
• Implements verification to ensure the expected plugin directory structure exists before attempting to publish

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
.github/workflows/reusable-release.yml	Adds artifact upload step for the release directory with 1-day retention
.github/workflows/reusable-release-wporg.yml	New reusable workflow that downloads release artifacts, verifies structure, and publishes to WordPress.org

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