Add paper_trail to initiatives_votes

[fblupi]

🎩 What? Why?

Add paper_trail to initiatives_votes.

Testing

Vote for an initiative and check if a new row withitem_type = Decidim::InitiativesVote has been added to the versions table. Try to delete it too and check again the versions table to see another one with destroy event.

📋 Checklist

🚨 Please review the guidelines for contributing to this repository.

• ❓ CONSIDER adding a unit test if your PR resolves an issue.
• ✔️ DO check open PR's to avoid duplicates.
• ✔️ DO keep pull requests small so they can be easily reviewed.
• ✔️ DO build locally before pushing.
• ✔️ DO make sure tests pass.
• ✔️ DO make sure any new changes are documented in docs/.
• ✔️ DO add and modify seeds if necessary.
• ✔️ DO add CHANGELOG upgrade notes if required.
• ✔️ DO add to GraphQL API if there are new public fields.
• ✔️ DO add link to MetaDecidim if it's a new feature.
• ❌AVOID breaking the continuous integration build.
• ❌AVOID making significant changes to the overall architecture.

♥️ Thank you!

[davidbeig]

Works great!

I have also removed an initiative and all the votes have a PaperTrail eveeent of destroy.