🎩 What? Why?

The Moderations dashboard, where the admin manages items that have been reported (i.e. spam), has a rather cryptic behaviour:

• There are two actions possible: unreport and hide. When something is hidden, it goes to the Hidden tab and once it's there, the only action possible is unreport, which moves the moderation back to the Not Hidden tab. But because the unreport command deletes the report_count to zero, the moderation cannot be hidden again, because reports are what store the hidden_at value, nor it can be eliminated, because there's no option for it.
• I've refactored the code so that a hidden moderation can be unhidden with a new unhide action. Reversing the hidden state is interesting not only to give the admin the freedom to do so, but because a moderation that has many reports (3 by default) is automatically hidden, which could be undesired. Also, the unhide command doesn't update the report_count to zero (as unreport did) because it really makes no sense to lose that information; it maybe made sense before that the unreport action was being used in practice to allow admins to unhide moderations in the Hidden tab. Finally, as now admin can hide/unhide moderations at will and report_count doesn't reset, it made more sense that the unreport action would allow the admin to get rid of a moderation altogether.

📌 Related Issues

• Related to Fix unhideable reported collaborative drafts and mail jobs #4706

📋 Subtasks

• Add CHANGELOG entry
• Add tests

📷 Screenshots (optional)

Moderations Not Hidden Tab

Moderations Hidden Tab (before)

Moderations Hidden Tab (after)