yum: remove the legacy unkinben personal repo entirely

Finish the artifactapi migration by dropping the last legacy Gitea-hosted
(git.query.consul) yum repo. The yum profile's purge => true then removes
/etc/yum.repos.d/unkin.repo from hosts. The jellyfin media role was the only
consumer; its jellyfin-* packages (jellyfin-web, jellyfin-server,
jellyfin-ffmpeg-bin) live only in unkinben and will stop receiving updates
until republished into artifactapi (e.g. rpm-internal-elN). Its other deps
(SDL2, ffmpeg, ffmpeg-devel) come from rpmfusion and are unaffected.

- remove the unkinben yumrepo definition from AlmaLinux/all_releases.yaml
- remove the unkinben ensure: present override from the jellyfin role

Claude-Session: https://claude.ai/code/session_015ur3i7D2azsMAWTSVABApv

hieradata/roles/apps/media/jellyfin.yaml

@@ -57,5 +57,3 @@ profiles::yum::global::repos:
     ensure: present
   rpmfusion-nonfree:
     ensure: present
-  unkinben:
-    ensure: present