Migrate away from our GNOME "AffectsTails" keyword

GNOME is moving from Bugzilla to their own GitLab instance and we won’t get an AffectTails label there, so we need to devise & implement something to replace the “AffectsTails” keyword we’ve been using on their Bugzilla.

This is currently about 19 open bugs on Bugzilla plus one that’s been migrated to GitLab already. I think this number will keep growing: we apply this keyword to bugs faster than they get fixed.

MUST:

Publish a usable list of GNOME bugs that affect Tails on a stable URL.
Display the bug title in that list.
Anyone can easily add a bug to the list (having to create an account somewhere is OK, needing special privileges is not).

SHOULD:

Make it clear which bugs were resolved upstream (e.g. allow listing only open ones or automatically strikethrough those that were resolved).

MAY:

Display bugs metadata e.g. affected product, bug title, last update time.
Allow filtering & sorting based on metadata.

Blueprint: https://tails.boum.org/blueprint/GNOME_bugs_that_affect_Tails/

Related issues

Blocks #15506 (closed)

Original created by @intrigeri on 15042 (Redmine)

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