Any user can access proposal's pages representing the "create a proposal" steps

[roxanaopr]

Any user can access the links from "create a new proposal" steps (compare. complete, preview, publish).

1. With account A login
2. Create an idea
3. Stop at any of the mentioned steps
4. Save the link for this step
5. Access link via incognito (logged in with another account or not logged in)

Observed: Any guest or user has access to the copied links

🎩 What? Why?

Please describe your pull request.

📌 Related Issues

#8386

Testing

Describe the best way to test or validate your PR.

📋 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.

📷 Screenshots

Please add screenshots of the changes you're proposing

♥️ Thank you!

[leio10]

👍

[leio10]

Thanks for taking care of this @roxanaopr! ❤️
Please, can you backport it to the 0.25 branch?