Fix group mentions in notifications

[quinHD]

🎩 What? Why?

This PR display fix the group mention in notifications. It's deeply explained in the issue #8485 .

📌 Related Issues

Link your PR to an issue

• Issue Fix groups mentions in Notifications #8485

Testing

Acceptance criteria

• Given that I'm a participant with a new user group mention notification,
  When I go to my notifications page
  Then I can see which group I was mentioned.

Step by Step

You need a user_group_mentioned notification. First of all, you have to belong to a group. To do that, log in with an alternative user and go to /profiles/<user_nickname>/groups. There, go to a group you administrate and invite your original user.
Then, log in with your original user an accept the group invitation from that you'll find in /profiles/<user_nickname>/groups.
Once you belong to a group, you are ready to receive the notification.

From the alternative user, create a comment in a proposal, in that comment, you have to mention the group the original user belongs to.
After that, go to /notifications with the original user logged and there, you''ll see a notification with the group mentioned.

Screenshots

📋 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

Staging:

♥️ Thank you!

[quinHD]

@decidim/product This feature is ready and uploaded in staging.

The base branch was changed.

[andreslucena]

While reviewing this issue, I found a couple of things:

1. This was initially implemented in Be able to mention groups #5763
2. There was a reported bug by me a couple of weeks ago with the exception that we have now in develop in Exception when mentioning UserGroups (stack level too deep) #8459. I found it in Metadecidim's Sentry, but I actually forgot about it 😅 . This PR will fix that also

[andreslucena]

I have a couple of suggestions and one general comment, can you check it please @quinHD?

[andreslucena]

👍🏽