[8.0] JobDB: update LastUpdateTime when the job is matched

[fstagni]

This (commit 9125b4b) fixes an obscure bug that was unfolding like the following:

1. Job X went to status "Waiting" at time T
2. Job X was finally matched at time T + Y (with Y more than 2 hours)
   • no update of LastUpdateTime field in JobDB, which was staying at time T
   • the job normally stays in status Matched only few seconds, before going to "Running"
3. StalledJobAgent looks, among other tasks, at jobs possibly stuck in status "Matched" for more than 2 hours, rescheduling them
   • if that happens in those few seconds when the status was "Matched" but the LastUpdateTime still T, those jobs were rescheduled.

BEGINRELEASENOTES

*WMS
FIX: JobDB: update LastUpdateTime when the job is matched

ENDRELEASENOTES

[DIRACGridBot]

Sweep summary

Sweep ran in https://github.com/DIRACGrid/DIRAC/actions/runs/9694203659

Failed:

• integration
  cherry-pick 2c4c947 into integration failed
  check merge conflicts on a local copy of this repository

  git fetch upstream
  git checkout upstream/integration -b cherry-pick-2-2c4c947b5-integration
  git cherry-pick -x -m 1 2c4c947b5
  # Fix the conflicts
  git cherry-pick --continue
  git commit --amend -m 'sweep: #7701 JobDB: update LastUpdateTime when the job is matched' --author='Federico Stagni <[email protected]>'
  git push -u origin cherry-pick-2-2c4c947b5-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] JobDB: update LastUpdateTime when the job is matched' \
       --body 'Sweep #7701 `JobDB: update LastUpdateTime when the job is matched` to `integration`.
  
  Adding original author @fstagni as watcher.
  
  BEGINRELEASENOTES
  
  *WMS
  FIX:  JobDB: update LastUpdateTime when the job is matched
  
  ENDRELEASENOTES
  Closes #7705'