fix: update release workflow to create an rc for styled-react

[pksjce]

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Latest commit: c464997

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[Copilot]

Pull Request Overview

This PR updates the release candidate workflow to ensure that both @primer/react and @primer/styled-react packages receive RC versions when creating release candidates. Previously, only @primer/react was versioned with the RC suffix. The change adapts this monorepo's release process to accommodate the styled-react package, which serves as a temporary bridge package between Primer React and styled-components.

Key Changes

• Modified the release-candidate job to loop through both package.json files (react and styled-react) when creating RC versions
• Applied the same RC version suffix pattern (-rc.<git-sha>) to both packages for consistency

[joshblack]

Just had one comment, otherwise looks good! Thanks for doing this 🙏

[joshblack]

Should be good to omit this since we're not updating the public API or anything 👀