Follow consistent runner naming and tagging

See compute-server-admin#7

TODO:

• fix .gitlab_ci.yml (!2 (merged), !3 (merged), https://zivgitlab.uni-muenster.de/HPC2SE-Project/pacxx-docker/-/jobs/10281)
• deactivate old runners
• test (https://zivgitlab.uni-muenster.de/HPC2SE-Project/pacxx-docker/-/jobs/10284)