🐛 Bug: ESLint config groups should be deduplicated by comment

[JoshuaKGoldberg]

Bug Report Checklist

• I have tried restarting my IDE and the issue persists.
• I have pulled the latest main branch of the repository.
• I have searched for related issues and found none that matched my issue.

Expected

If two rules objects from blockESLint's Addons have the same comment, they should be merged together. This will allow end-users to add to the default // Stylistic concerns that don't interfere with Prettier group.

Actual

https://github.com/JoshuaKGoldberg/eslint-plugin-package-json/pull/993/files#r2027963553 shows that no such merging is done now.

Additional Info

🎁

[github-actions]

🎉 This is included in version v2.26.4 🎉

The release is available on:

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

Cheers! 📦🚀