[8.0] HTCondorCE: fix HOME for useSSL

[andresailer]

I managed to run some jobs at CERN with the UseSSLSubmission and the help of the CERN batch people.
But the two processes I checked don't have HOME in their environ on the dirac servers, mine or lbcertifdirac. So I propose to fix the location of the files here.

BEGINRELEASENOTES
*Resources
FIX: HTCondorCE: fix exception when UseSSLSubmission is true. The SiteDirector environment does not have HOME. Always use /home/dirac/.globus to get userkey and usercert files.
*Core
FIX: Locations.getCertificateAndKeyLocation: fix exception when HOME is not set.

ENDRELEASENOTES

[DIRACGridBot]

Sweep summary

Sweep ran in https://github.com/DIRACGrid/DIRAC/actions/runs/9563646367

Failed:

• integration
  cherry-pick 34d5e05 into integration failed
  check merge conflicts on a local copy of this repository

  git fetch upstream
  git checkout upstream/integration -b cherry-pick-2-34d5e0515-integration
  git cherry-pick -x -m 1 34d5e0515
  # Fix the conflicts
  git cherry-pick --continue
  git commit --amend -m 'sweep: #7675 HTCondorCE: fix HOME for useSSL' --author='Andre Sailer <[email protected]>'
  git push -u origin cherry-pick-2-34d5e0515-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] HTCondorCE: fix HOME for useSSL' \
       --body 'Sweep #7675 `HTCondorCE: fix HOME for useSSL` to `integration`.
  
  Adding original author @andresailer as watcher.
  
  BEGINRELEASENOTES
  *Resources
  FIX: HTCondorCE: fix exception when UseSSLSubmission is true. The SiteDirector environment does not have HOME. Always use /home/dirac/.globus to get userkey and usercert files.
  *Core
  FIX: Locations.getCertificateAndKeyLocation: fix exception when HOME is not set.
  
  ENDRELEASENOTES
  Closes #7676'