[8.0] fix: get setup from gConfig in ComponentSupervisionAgent

[aldbr]

Solves #7235
Not entirely sure that this is the right fix.

BEGINRELEASENOTES
*Framework
CHANGE: ComponentSupervisionAgent: use gConfig to get the setup from /DIRAC/Setup
CHANGE: ComponentSupervisionAgent remove Setup option
ENDRELEASENOTES

[andresailer]

• The Setup option has to be removed from the ConfigTemplate, this also makes the test fail now.
• Please note in the Release Notes that the option was removed.

[DIRACGridBot]

Sweep summary

Sweep ran in https://github.com/DIRACGrid/DIRAC/actions/runs/6484826852

Failed:

• integration
  cherry-pick f741dcc into integration failed
  check merge conflicts on a local copy of this repository

  git fetch upstream
  git checkout upstream/integration -b cherry-pick-2-f741dccf2-integration
  git cherry-pick -x -m 1 f741dccf2
  # Fix the conflicts
  git cherry-pick --continue
  git commit --amend -m 'sweep: #7236 fix: get setup from gConfig in ComponentSupervisionAgent' --author='aldbr <[email protected]>'
  git push -u origin cherry-pick-2-f741dccf2-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: get setup from gConfig in ComponentSupervisionAgent' \
       --body 'Sweep #7236 `fix: get setup from gConfig in ComponentSupervisionAgent` to `integration`.
  
  Adding original author @aldbr as watcher.
  
  BEGINRELEASENOTES
  *Framework
  FIX: use gConfig to get the setup in ComponentSupervisionAgent
  ENDRELEASENOTES
  Closes #7240'