[8.0] SiteDirector - shuffle queues in a dedicated function

[atsareg]

Shuffle queues in a dedicated function that can be overriden in a derived class

BEGINRELEASENOTES

*WorkloadManagementSubsystem
FIX: SiteDirector - shuffle queues in a dedicated function

ENDRELEASENOTES

[atsareg]

To merge ?

[DIRACGridBot]

Sweep summary

Sweep ran in https://github.com/DIRACGrid/DIRAC/actions/runs/21366231835

Failed:

• integration
  cherry-pick 2fe55c3 into integration failed
  check merge conflicts on a local copy of this repository

  git fetch upstream
  git checkout upstream/integration -b cherry-pick-2-2fe55c3047-integration
  git cherry-pick -x -m 1 2fe55c3047
  # Fix the conflicts
  git cherry-pick --continue
  git commit --amend -m 'sweep: #8428 SiteDirector - shuffle queues in a dedicated function' --author='Andrei Tsaregorodtsev <atsareg@in2p3.fr>'
  git push -u origin cherry-pick-2-2fe55c3047-integration
  
  # If you have the GitHub CLI installed the PR can be made with
  gh pr create \
       --label 'sweep:from rel-v8r0' \
       --base integration \
       --repo DIRACGrid/DIRAC \
       --title '[sweep:integration] SiteDirector - shuffle queues in a dedicated function' \
       --body 'Sweep #8428 `SiteDirector - shuffle queues in a dedicated function` to `integration`.
  
  Adding original author @atsareg as watcher.
  
  BEGINRELEASENOTES
  
  *WorkloadManagementSubsystem
  FIX: SiteDirector - shuffle queues in a dedicated function
  
  ENDRELEASENOTES
  Closes #8437'