Rebuild the information gathering about the marge queue and how the
information is later prompted to the user.
The queue provided to the user is sorted, so the user knows what will be
merged first (when the corresponding merge request pipeline succeeds).
Signed-off-by: Sergi Blanch Torne <sergi.blanch.torne@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37395>
b0ea4d36ff