staging/counters: Decommission journal client

They were migrated to the dynamic infra (manually stopped in counters0.staging, currently running in the dynamic infra).

Octo-diff wants to drop related journal clients in counters0.staging [1]

No change on production counters [2]

[1]

swh-octodiff counters0.staging

*** Running octocatalog-diff on host counters0.internal.staging.swh.network
I, [2023-12-11T15:10:07.835106 #2825041]  INFO -- : Catalogs compiled for counters0.internal.staging.swh.network
I, [2023-12-11T15:10:08.121012 #2825041]  INFO -- : Diffs computed for counters0.internal.staging.swh.network
diff origin/production/counters0.internal.staging.swh.network current/counters0.internal.staging.swh.network
*******************************************
- File[/etc/softwareheritage/counters/journal_client.yml]
*******************************************
- File[/etc/softwareheritage/journal]
*******************************************
- File[/etc/systemd/system/swh-counters-journal-client.service]
*******************************************
- Package[python3-swh.journal]
*******************************************
- Service[swh-counters-journal-client]
*******************************************
- Systemd::Unit_file[swh-counters-journal-client.service]
*******************************************
*** End octocatalog-diff on counters0.internal.staging.swh.network

[2]

swh-octo-diff counters1.production

*** Running octocatalog-diff on host counters1.internal.softwareheritage.org
I, [2023-12-11T15:09:10.633139 #2818528]  INFO -- : Catalogs compiled for counters1.internal.softwareheritage.org
I, [2023-12-11T15:09:10.934835 #2818528]  INFO -- : Diffs computed for counters1.internal.softwareheritage.org
I, [2023-12-11T15:09:10.934870 #2818528]  INFO -- : No differences
*** End octocatalog-diff on counters1.internal.softwareheritage.org
+ set +x
/home/tony/work/inria/repo/swh/puppet-environment/swh-site

Refs. swh/infra/sysadm-environment#5179 (closed)