fix(Resources): AREX can submit jobs without proxy (token only)

[aldbr]

Until now, submission with tokens was not working with the AREXCE.
There is a bug preventing submission of jobs when a token is used along with a delegation ID.

(By the way, I wonder whether the delegation mechanism is useful in our context. I will make sure submission works without it, and if it's the case, then I will delete it from v9.)
Update: it is needed when we use proxies apparently.

BEGINRELEASENOTES
*Resources
FIX: AREX interactions with tokens
ENDRELEASENOTES

[DIRACGridBot]

Sweep summary

Sweep ran in https://github.com/DIRACGrid/DIRAC/actions/runs/11300426303

Failed:

• integration
  cherry-pick b3cee1a into integration failed
  check merge conflicts on a local copy of this repository

  git fetch upstream
  git checkout upstream/integration -b cherry-pick-2-b3cee1aa0-integration
  git cherry-pick -x -m 1 b3cee1aa0
  # Fix the conflicts
  git cherry-pick --continue
  git commit --amend -m 'sweep: #7824 fix(Resources): AREX can submit jobs without proxy (token only)' --author='aldbr <[email protected]>'
  git push -u origin cherry-pick-2-b3cee1aa0-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] fix(Resources): AREX can submit jobs without proxy (token only)' \
       --body 'Sweep #7824 `fix(Resources): AREX can submit jobs without proxy (token only)` to `integration`.
  
  Adding original author @aldbr as watcher.
  
  BEGINRELEASENOTES
  *Resources
  FIX: AREX interactions with tokens
  ENDRELEASENOTES
  Closes #7830'