Unify data directories naming scheme

PR https://github.com/kernelci/kernelci-deploy/pull/192 currently migrates paths as they are but it could be useful to create a common naming scheme for data directories (https://github.com/kernelci/kernelci-deploy/pull/192#discussion_r1902138687 + https://github.com/kernelci/kernelci-deploy/pull/192#discussion_r1902141869)