[hackathon] Only include resources that are actually able to accept jobs on DIRAC certification instance

The DIRAC certification instance seems to contain a number of resources that haven't worked in months (years?), making it difficult to distinguish real DIRAC errors from site failures.

So far we have:
**Sites/CE:**

LCG
htcondor-ce-[1,2,3,4]-kit.gridka.de_condor: submission fails with
```
/opt/dirac/runit/WorkloadManagement/SiteDirectorDteam/log/current:Command ['condor_submit', '-terse', '-pool', 'htcondor-ce-3-kit.gridka.de:9619', '-remote', 'htcondor-ce-3-kit.gridka.de', '/opt/dirac/data/HTCondor/work/HTCondorCE_axlxafve.sub'] failed with: 1 - ERROR: Failed to connect to queue manager htcondor-ce-3-kit.gridka.de
```
According to their bdii the condor CE still support dteam. Should this be followed up or the resource deleted ? If kept, they probably don't run EL7 any longer either.

There is a test that explicitly targets GRIF which hasn't worked in over a year:
```
/opt/dirac/runit/WorkloadManagement/SiteDirectorDteam/log/current:2024-06-07T15:52:39,588024Z WorkloadManagement/SiteDirectorDteam/node16.datagrid.cea.fr ERROR: Failed getting the status of the CE. Response: 403 - User can't be assigned configuration
```
Ask site or retire ?

CERN:
```
/opt/dirac/runit/WorkloadManagement/SiteDirectorDteam/log/current:2024-06-07T15:41:24,161662Z WorkloadManagement/SiteDirectorDteam/WorkloadManagement/SiteDirectorDteam ERROR: The following errors occurred during the pilot submission operation Command ['condor_submit', '-terse', '-pool', 'ce504.cern.ch:9619', '-remote', 'ce504.cern.ch', '/opt/dirac/data/HTCondor/work/HTCondorCE_no8_ygwr.sub'] failed with: 1 - ERROR: Failed to connect to queue manager ce504.cern.ch
```
I think giving up on CERN is a bad idea.

LCG.NCBJ.pl
One HelloWorld job recently succeeded, but the rest fails. Possibly related to storage elements ?

LCG.RAL.uk
Currently doesn't work due to: #7657, but should work in principle

Imperial, Glasgow, RALPPD: Should all work and can be fixed if it doesn't. Imperial cloud is currently (07/06/24) broken, but Simon and me are onto it. Everything else should work.

**Storage Elements:**
dcache.du.cesnet.cz (CESNET-SE) does not exist, at least I couldn't find it in the gocdb. Remove from config ?
IN2P3-SE ( ccsrm.in2p3.fr) does exist, needs verifying to see if it still takes dteam data.
RAL-SE does exist, but does it still take dteam ?
UKI-LT2-IC-HEP-disk and UKI-SOUTHGRID-RALPP-disk should work and if not the sites should be told.
We could probably rope Glasgow in, if you need a further storage element.

Once we have a set of sites/storage elements that *should* work, we should then remove any obsolete ones from the tests.
I think this ticket should be a group effort :-D.