Update builder image and RHGitaly configuration to spawn Mercurial subprocesses
As this MR also contains the base image bump, we're running the full pipeline to check that everything will be ok with the future 17.0.0rc
All legacy (hg-git based) Projects have been automatically migrated to native with the upgrade of 2025-01-23
As this MR also contains the base image bump, we're running the full pipeline to check that everything will be ok with the future 17.0.0rc