Fix mirrors hang when /status endpoint is down

[h8d13]

Aims to fix #4029 or start a discussion about it (I've had this when the endpoint is down).

By assigning a bool to the def load_remote_mirrors in the parent (which was naïve about the state).

This can be tested on the branch above and using something similar to block URL (temporarily):

echo "127.0.0.1 archlinux.org" | sudo tee -a /etc/hosts or when it's down like currently (15:00 UTC+1).

Second thing I'm wondering about:

  def get_status_by_region(self, region: str, speed_sort: bool) -> list[MirrorStatusEntryV3]:
      mappings = self._mappings()
      region_list = mappings[region]

      # Only sort if we have remote mirror data with score/speed info
      # Local mirrors lack this data and can be modified manually before-hand
      # Or reflector potentially ran already
      if self._fetched_remote and speed_sort:
          # original return
          return sorted(region_list, key=lambda mirror: (mirror.score, mirror.speed))
      # just return as-is without sorting?
      return region_list

Another day another DDoS ? I'll ping thsi for the funny lore too #3974

[h8d13]

Also had fun on another branch where we can use mirror endpoint from archlinux.de (or other models?)

master...h8d13:archinstall-patch:refs/heads/dot-mirrors-de