L2SS-294: Update SKAO repo, image versions, refactor a bit

Thomas Juergesrequested to merge
L2SS-294-Update_SKAO_image_versions into master

I moved the image versions to the .env file, updated the SKAO repo and updated the SKAO image naming. They replaced the "/" between the registry user and the image name with a "-".

Closes L2SS-294

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