Still report packages as "out of date" on Archweb?

This PoC eventually aims to replace the "flag out of date" button on Archweb (at least that's one of the pursued goal 😸).

However, it might still be useful to have packages reported as "out of date" on Archweb? If the "flag out of date" button / mechanism is ever removed & replaced by this PoC, maybe we should find a way to still report packages out of date on Archweb when they are?

One potential way to do this would be to look if the GitLab repo for the a package contains an issue opened with the "scope::out-of-date" label and, if so, report it out of date (and link to the issue?). Not sure how such an automatic / periodic check could be done, but I'm just throwing ideas.
When it comes to "unflagging" the package, we should still give the possibility to packagers to do so and pushing a new release should still remove the flag (like it's the case today). So that part shouldn't change that much.
EDIT: Or, ideally, unflag the package on Archweb when the version comparaison is clear (in addition of closing the related GitLab issue).

This will most likely require some further discussions around implementations and possibilities but I'm just creating that issue as a reminder.